/[svn]/libgig/trunk/src/gig.cpp

Diff of /libgig/trunk/src/gig.cpp

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-revision 930 by schoenebeck,
Sun Oct 29 17:57:20 2006 UTC
+revision 3928 by schoenebeck,
Tue Jun 15 11:38:38 2021 UTC
 Line 1
  /***************************************************************************
   *                                                                         *
-  *   libgig - C++ cross-platform Gigasampler format file loader library    *
+  *   libgig - C++ cross-platform Gigasampler format file access library    *
   *                                                                         *
-  *   Copyright (C) 2003-2006 by Christian Schoenebeck                      *
+  *   Copyright (C) 2003-2021 by Christian Schoenebeck                      *
   *                              <cuse@users.sourceforge.net>               *
   *                                                                         *
   *   This library is free software; you can redistribute it and/or modify  *
 Line 24
  #include "gig.h"
  #include "helper.h"
+ #include "Serialization.h"
+ #include <algorithm>
  #include <math.h>
  #include <iostream>
+ #include <assert.h>
+ /// libgig's current file format version (for extending the original Giga file
+ /// format with libgig's own custom data / custom features).
+ #define GIG_FILE_EXT_VERSION    2
  /// Initial size of the sample buffer which is used for decompression of
  /// compressed sample wave streams - this value should always be bigger than
-Line 49
+Line 56
  #define GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(x)    ((x & 0x03) << 3)
  #define GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(x)  ((x & 0x03) << 5)
- namespace gig {
+ #define SRLZ(member) \
+     archive->serializeMember(*this, member, #member);
- // *************** progress_t ***************
- // *
-     progress_t::progress_t() {
-         callback    = NULL;
-         custom      = NULL;
-         __range_min = 0.0f;
-         __range_max = 1.0f;
-     }
-     // private helper function to convert progress of a subprocess into the global progress
-     static void __notify_progress(progress_t* pProgress, float subprogress) {
-         if (pProgress && pProgress->callback) {
-             const float totalrange    = pProgress->__range_max - pProgress->__range_min;
-             const float totalprogress = pProgress->__range_min + subprogress * totalrange;
-             pProgress->factor         = totalprogress;
-             pProgress->callback(pProgress); // now actually notify about the progress
-         }
-     }
-     // private helper function to divide a progress into subprogresses
-     static void __divide_progress(progress_t* pParentProgress, progress_t* pSubProgress, float totalTasks, float currentTask) {
-         if (pParentProgress && pParentProgress->callback) {
-             const float totalrange    = pParentProgress->__range_max - pParentProgress->__range_min;
-             pSubProgress->callback    = pParentProgress->callback;
-             pSubProgress->custom      = pParentProgress->custom;
-             pSubProgress->__range_min = pParentProgress->__range_min + totalrange * currentTask / totalTasks;
-             pSubProgress->__range_max = pSubProgress->__range_min + totalrange / totalTasks;
-         }
-     }
+ namespace gig {
  // *************** Internal functions for sample decompression ***************
  // *
-Line 121 
 namespace {
+Line 99 
 namespace {
      void Decompress16(int compressionmode, const unsigned char* params,
                        int srcStep, int dstStep,
                        const unsigned char* pSrc, int16_t* pDst,
-                       unsigned long currentframeoffset,
+                       file_offset_t currentframeoffset,
-                       unsigned long copysamples)
+                       file_offset_t copysamples)
      {
          switch (compressionmode) {
              case 0: // 16 bit uncompressed
-Line 158 
 namespace {
+Line 136 
 namespace {
      void Decompress24(int compressionmode, const unsigned char* params,
                        int dstStep, const unsigned char* pSrc, uint8_t* pDst,
-                       unsigned long currentframeoffset,
+                       file_offset_t currentframeoffset,
-                       unsigned long copysamples, int truncatedBits)
+                       file_offset_t copysamples, int truncatedBits)
      {
          int y, dy, ddy, dddy;
-Line 254 
 namespace {
+Line 232 
 namespace {
  }
+ // *************** Internal CRC-32 (Cyclic Redundancy Check) functions  ***************
+ // *
+     static uint32_t* __initCRCTable() {
+         static uint32_t res[256];
+         for (int i = 0 ; i < 256 ; i++) {
+             uint32_t c = i;
+             for (int j = 0 ; j < 8 ; j++) {
+                 c = (c & 1) ? 0xedb88320 ^ (c >> 1) : c >> 1;
+             }
+             res[i] = c;
+         }
+         return res;
+     }
+     static const uint32_t* __CRCTable = __initCRCTable();
+     /**
+      * Initialize a CRC variable.
+      *
+      * @param crc - variable to be initialized
+      */
+     inline static void __resetCRC(uint32_t& crc) {
+         crc = 0xffffffff;
+     }
+     /**
+      * Used to calculate checksums of the sample data in a gig file. The
+      * checksums are stored in the 3crc chunk of the gig file and
+      * automatically updated when a sample is written with Sample::Write().
+      *
+      * One should call __resetCRC() to initialize the CRC variable to be
+      * used before calling this function the first time.
+      *
+      * After initializing the CRC variable one can call this function
+      * arbitrary times, i.e. to split the overall CRC calculation into
+      * steps.
+      *
+      * Once the whole data was processed by __calculateCRC(), one should
+      * call __finalizeCRC() to get the final CRC result.
+      *
+      * @param buf     - pointer to data the CRC shall be calculated of
+      * @param bufSize - size of the data to be processed
+      * @param crc     - variable the CRC sum shall be stored to
+      */
+     static void __calculateCRC(unsigned char* buf, size_t bufSize, uint32_t& crc) {
+         for (size_t i = 0 ; i < bufSize ; i++) {
+             crc = __CRCTable[(crc ^ buf[i]) & 0xff] ^ (crc >> 8);
+         }
+     }
+     /**
+      * Returns the final CRC result.
+      *
+      * @param crc - variable previously passed to __calculateCRC()
+      */
+     inline static void __finalizeCRC(uint32_t& crc) {
+         crc ^= 0xffffffff;
+     }
+ // *************** Other Internal functions  ***************
+ // *
+     static split_type_t __resolveSplitType(dimension_t dimension) {
+         return (
+             dimension == dimension_layer ||
+             dimension == dimension_samplechannel ||
+             dimension == dimension_releasetrigger ||
+             dimension == dimension_keyboard ||
+             dimension == dimension_roundrobin ||
+             dimension == dimension_random ||
+             dimension == dimension_smartmidi ||
+             dimension == dimension_roundrobinkeyboard
+         ) ? split_type_bit : split_type_normal;
+     }
+     static int __resolveZoneSize(dimension_def_t& dimension_definition) {
+         return (dimension_definition.split_type == split_type_normal)
+         ? int(128.0 / dimension_definition.zones) : 0;
+     }
+ // *************** leverage_ctrl_t ***************
+ // *
+     void leverage_ctrl_t::serialize(Serialization::Archive* archive) {
+         SRLZ(type);
+         SRLZ(controller_number);
+     }
+ // *************** crossfade_t ***************
+ // *
+     void crossfade_t::serialize(Serialization::Archive* archive) {
+         SRLZ(in_start);
+         SRLZ(in_end);
+         SRLZ(out_start);
+         SRLZ(out_end);
+     }
+ // *************** eg_opt_t ***************
+ // *
+     eg_opt_t::eg_opt_t() {
+         AttackCancel     = true;
+         AttackHoldCancel = true;
+         Decay1Cancel     = true;
+         Decay2Cancel     = true;
+         ReleaseCancel    = true;
+     }
+     void eg_opt_t::serialize(Serialization::Archive* archive) {
+         SRLZ(AttackCancel);
+         SRLZ(AttackHoldCancel);
+         SRLZ(Decay1Cancel);
+         SRLZ(Decay2Cancel);
+         SRLZ(ReleaseCancel);
+     }
  // *************** Sample ***************
  // *
-     unsigned int Sample::Instances = 0;
+     size_t       Sample::Instances = 0;
      buffer_t     Sample::InternalDecompressionBuffer;
      /** @brief Constructor.
-Line 277 
 namespace {
+Line 385 
 namespace {
       *                         ('wvpl') list chunk
       * @param fileNo         - number of an extension file where this sample
       *                         is located, 0 otherwise
+      * @param index          - wave pool index of sample (may be -1 on new sample)
       */
-     Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset, unsigned long fileNo) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) {
+     Sample::Sample(File* pFile, RIFF::List* waveList, file_offset_t WavePoolOffset, unsigned long fileNo, int index)
-         pInfo->UseFixedLengthStrings = true;
+         : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset)
+     {
+         static const DLS::Info::string_length_t fixedStringLengths[] = {
+             { CHUNK_ID_INAM, 64 },
+             { 0, 0 }
+         };
+         pInfo->SetFixedStringLengths(fixedStringLengths);
          Instances++;
          FileNo = fileNo;
+         __resetCRC(crc);
+         // if this is not a new sample, try to get the sample's already existing
+         // CRC32 checksum from disk, this checksum will reflect the sample's CRC32
+         // checksum of the time when the sample was consciously modified by the
+         // user for the last time (by calling Sample::Write() that is).
+         if (index >= 0) { // not a new file ...
+             try {
+                 uint32_t crc = pFile->GetSampleChecksumByIndex(index);
+                 this->crc = crc;
+             } catch (...) {}
+         }
          pCk3gix = waveList->GetSubChunk(CHUNK_ID_3GIX);
          if (pCk3gix) {
+             pCk3gix->SetPos(0);
              uint16_t iSampleGroup = pCk3gix->ReadInt16();
              pGroup = pFile->GetGroup(iSampleGroup);
          } else { // '3gix' chunk missing
-Line 294 
 namespace {
+Line 423 
 namespace {
          pCkSmpl = waveList->GetSubChunk(CHUNK_ID_SMPL);
          if (pCkSmpl) {
+             pCkSmpl->SetPos(0);
              Manufacturer  = pCkSmpl->ReadInt32();
              Product       = pCkSmpl->ReadInt32();
              SamplePeriod  = pCkSmpl->ReadInt32();
-Line 314 
 namespace {
+Line 445 
 namespace {
              Manufacturer  = 0;
              Product       = 0;
              SamplePeriod  = uint32_t(1000000000.0 / SamplesPerSecond + 0.5);
-             MIDIUnityNote = 64;
+             MIDIUnityNote = 60;
              FineTune      = 0;
+             SMPTEFormat   = smpte_format_no_offset;
              SMPTEOffset   = 0;
              Loops         = 0;
              LoopID        = 0;
+             LoopType      = loop_type_normal;
              LoopStart     = 0;
              LoopEnd       = 0;
              LoopFraction  = 0;
-Line 338 
 namespace {
+Line 471 
 namespace {
          Dithered          = false;
          TruncatedBits     = 0;
          if (Compressed) {
+             ewav->SetPos(0);
              uint32_t version = ewav->ReadInt32();
-             if (version == 3 && BitDepth == 24) {
+             if (version > 2 && BitDepth == 24) {
                  Dithered = ewav->ReadInt32();
                  ewav->SetPos(Channels == 2 ? 84 : 64);
                  TruncatedBits = ewav->ReadInt32();
-Line 347 
 namespace {
+Line 482 
 namespace {
              ScanCompressedSample();
          }
-         // we use a buffer for decompression and for truncating 24 bit samples to 16 bit
+         // we use a buffer for decompression only
-         if ((Compressed || BitDepth == 24) && !InternalDecompressionBuffer.Size) {
+         if (Compressed && !InternalDecompressionBuffer.Size) {
              InternalDecompressionBuffer.pStart = new unsigned char[INITIAL_SAMPLE_BUFFER_SIZE];
              InternalDecompressionBuffer.Size   = INITIAL_SAMPLE_BUFFER_SIZE;
          }
-Line 358 
 namespace {
+Line 493 
 namespace {
      }
      /**
+      * Make a (semi) deep copy of the Sample object given by @a orig (without
+      * the actual waveform data) and assign it to this object.
+      *
+      * Discussion: copying .gig samples is a bit tricky. It requires three
+      * steps:
+      * 1. Copy sample's meta informations (done by CopyAssignMeta()) including
+      *    its new sample waveform data size.
+      * 2. Saving the file (done by File::Save()) so that it gains correct size
+      *    and layout for writing the actual wave form data directly to disc
+      *    in next step.
+      * 3. Copy the waveform data with disk streaming (done by CopyAssignWave()).
+      *
+      * @param orig - original Sample object to be copied from
+      */
+     void Sample::CopyAssignMeta(const Sample* orig) {
+         // handle base classes
+         DLS::Sample::CopyAssignCore(orig);
+         // handle actual own attributes of this class
+         Manufacturer = orig->Manufacturer;
+         Product = orig->Product;
+         SamplePeriod = orig->SamplePeriod;
+         MIDIUnityNote = orig->MIDIUnityNote;
+         FineTune = orig->FineTune;
+         SMPTEFormat = orig->SMPTEFormat;
+         SMPTEOffset = orig->SMPTEOffset;
+         Loops = orig->Loops;
+         LoopID = orig->LoopID;
+         LoopType = orig->LoopType;
+         LoopStart = orig->LoopStart;
+         LoopEnd = orig->LoopEnd;
+         LoopSize = orig->LoopSize;
+         LoopFraction = orig->LoopFraction;
+         LoopPlayCount = orig->LoopPlayCount;
+         // schedule resizing this sample to the given sample's size
+         Resize(orig->GetSize());
+     }
+     /**
+      * Should be called after CopyAssignMeta() and File::Save() sequence.
+      * Read more about it in the discussion of CopyAssignMeta(). This method
+      * copies the actual waveform data by disk streaming.
+      *
+      * @e CAUTION: this method is currently not thread safe! During this
+      * operation the sample must not be used for other purposes by other
+      * threads!
+      *
+      * @param orig - original Sample object to be copied from
+      */
+     void Sample::CopyAssignWave(const Sample* orig) {
+         const int iReadAtOnce = 32*1024;
+         char* buf = new char[iReadAtOnce * orig->FrameSize];
+         Sample* pOrig = (Sample*) orig; //HACK: remove constness for now
+         file_offset_t restorePos = pOrig->GetPos();
+         pOrig->SetPos(0);
+         SetPos(0);
+         for (file_offset_t n = pOrig->Read(buf, iReadAtOnce); n;
+                            n = pOrig->Read(buf, iReadAtOnce))
+         {
+             Write(buf, n);
+         }
+         pOrig->SetPos(restorePos);
+         delete [] buf;
+     }
+     /**
       * Apply sample and its settings to the respective RIFF chunks. You have
       * to call File::Save() to make changes persistent.
       *
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
-      * @throws DLS::Exception if FormatTag != WAVE_FORMAT_PCM or no sample data
+      * @param pProgress - callback function for progress notification
+      * @throws DLS::Exception if FormatTag != DLS_WAVE_FORMAT_PCM or no sample data
       *                        was provided yet
       * @throws gig::Exception if there is any invalid sample setting
       */
-     void Sample::UpdateChunks() {
+     void Sample::UpdateChunks(progress_t* pProgress) {
          // first update base class's chunks
-         DLS::Sample::UpdateChunks();
+         DLS::Sample::UpdateChunks(pProgress);
          // make sure 'smpl' chunk exists
          pCkSmpl = pWaveList->GetSubChunk(CHUNK_ID_SMPL);
-         if (!pCkSmpl) pCkSmpl = pWaveList->AddSubChunk(CHUNK_ID_SMPL, 60);
+         if (!pCkSmpl) {
+             pCkSmpl = pWaveList->AddSubChunk(CHUNK_ID_SMPL, 60);
+             memset(pCkSmpl->LoadChunkData(), 0, 60);
+         }
          // update 'smpl' chunk
          uint8_t* pData = (uint8_t*) pCkSmpl->LoadChunkData();
          SamplePeriod = uint32_t(1000000000.0 / SamplesPerSecond + 0.5);
-         memcpy(&pData[0], &Manufacturer, 4);
+         store32(&pData[0], Manufacturer);
-         memcpy(&pData[4], &Product, 4);
+         store32(&pData[4], Product);
-         memcpy(&pData[8], &SamplePeriod, 4);
+         store32(&pData[8], SamplePeriod);
-         memcpy(&pData[12], &MIDIUnityNote, 4);
+         store32(&pData[12], MIDIUnityNote);
-         memcpy(&pData[16], &FineTune, 4);
+         store32(&pData[16], FineTune);
-         memcpy(&pData[20], &SMPTEFormat, 4);
+         store32(&pData[20], SMPTEFormat);
-         memcpy(&pData[24], &SMPTEOffset, 4);
+         store32(&pData[24], SMPTEOffset);
-         memcpy(&pData[28], &Loops, 4);
+         store32(&pData[28], Loops);
          // we skip 'manufByt' for now (4 bytes)
-         memcpy(&pData[36], &LoopID, 4);
+         store32(&pData[36], LoopID);
-         memcpy(&pData[40], &LoopType, 4);
+         store32(&pData[40], LoopType);
-         memcpy(&pData[44], &LoopStart, 4);
+         store32(&pData[44], LoopStart);
-         memcpy(&pData[48], &LoopEnd, 4);
+         store32(&pData[48], LoopEnd);
-         memcpy(&pData[52], &LoopFraction, 4);
+         store32(&pData[52], LoopFraction);
-         memcpy(&pData[56], &LoopPlayCount, 4);
+         store32(&pData[56], LoopPlayCount);
          // make sure '3gix' chunk exists
          pCk3gix = pWaveList->GetSubChunk(CHUNK_ID_3GIX);
-Line 414 
 namespace {
+Line 620 
 namespace {
          }
          // update '3gix' chunk
          pData = (uint8_t*) pCk3gix->LoadChunkData();
-         memcpy(&pData[0], &iSampleGroup, 2);
+         store16(&pData[0], iSampleGroup);
+         // if the library user toggled the "Compressed" attribute from true to
+         // false, then the EWAV chunk associated with compressed samples needs
+         // to be deleted
+         RIFF::Chunk* ewav = pWaveList->GetSubChunk(CHUNK_ID_EWAV);
+         if (ewav && !Compressed) {
+             pWaveList->DeleteSubChunk(ewav);
+         }
      }
      /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).
      void Sample::ScanCompressedSample() {
          //TODO: we have to add some more scans here (e.g. determine compression rate)
          this->SamplesTotal = 0;
-         std::list<unsigned long> frameOffsets;
+         std::list<file_offset_t> frameOffsets;
          SamplesPerFrame = BitDepth == 24 ? 256 : 2048;
          WorstCaseFrameSize = SamplesPerFrame * FrameSize + Channels; // +Channels for compression flag
-Line 437 
 namespace {
+Line 651 
 namespace {
                  const int mode_l = pCkData->ReadUint8();
                  const int mode_r = pCkData->ReadUint8();
                  if (mode_l > 5 || mode_r > 5) throw gig::Exception("Unknown compression mode");
-                 const unsigned long frameSize = bytesPerFrame[mode_l] + bytesPerFrame[mode_r];
+                 const file_offset_t frameSize = bytesPerFrame[mode_l] + bytesPerFrame[mode_r];
                  if (pCkData->RemainingBytes() <= frameSize) {
                      SamplesInLastFrame =
-Line 456 
 namespace {
+Line 670 
 namespace {
                  const int mode = pCkData->ReadUint8();
                  if (mode > 5) throw gig::Exception("Unknown compression mode");
-                 const unsigned long frameSize = bytesPerFrame[mode];
+                 const file_offset_t frameSize = bytesPerFrame[mode];
                  if (pCkData->RemainingBytes() <= frameSize) {
                      SamplesInLastFrame =
-Line 472 
 namespace {
+Line 686 
 namespace {
          // Build the frames table (which is used for fast resolving of a frame's chunk offset)
          if (FrameTable) delete[] FrameTable;
-         FrameTable = new unsigned long[frameOffsets.size()];
+         FrameTable = new file_offset_t[frameOffsets.size()];
-         std::list<unsigned long>::iterator end  = frameOffsets.end();
+         std::list<file_offset_t>::iterator end  = frameOffsets.end();
-         std::list<unsigned long>::iterator iter = frameOffsets.begin();
+         std::list<file_offset_t>::iterator iter = frameOffsets.begin();
          for (int i = 0; iter != end; i++, iter++) {
              FrameTable[i] = *iter;
          }
-Line 515 
 namespace {
+Line 729 
 namespace {
       *                      the cached sample data in bytes
       * @see                 ReleaseSampleData(), Read(), SetPos()
       */
-     buffer_t Sample::LoadSampleData(unsigned long SampleCount) {
+     buffer_t Sample::LoadSampleData(file_offset_t SampleCount) {
          return LoadSampleDataWithNullSamplesExtension(SampleCount, 0); // 0 amount of NullSamples
      }
-Line 574 
 namespace {
+Line 788 
 namespace {
       *                           size of the cached sample data in bytes
       * @see                      ReleaseSampleData(), Read(), SetPos()
       */
-     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount) {
+     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(file_offset_t SampleCount, uint NullSamplesCount) {
          if (SampleCount > this->SamplesTotal) SampleCount = this->SamplesTotal;
          if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
-         unsigned long allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
+         file_offset_t allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
+         SetPos(0); // reset read position to begin of sample
          RAMCache.pStart            = new int8_t[allocationsize];
          RAMCache.Size              = Read(RAMCache.pStart, SampleCount) * this->FrameSize;
          RAMCache.NullExtensionSize = allocationsize - RAMCache.Size;
-Line 615 
 namespace {
+Line 830 
 namespace {
          if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
          RAMCache.pStart = NULL;
          RAMCache.Size   = 0;
+         RAMCache.NullExtensionSize = 0;
      }
      /** @brief Resize sample.
-Line 635 
 namespace {
+Line 851 
 namespace {
       * enlarged samples before calling File::Save() as this might exceed the
       * current sample's boundary!
       *
-      * Also note: only WAVE_FORMAT_PCM is currently supported, that is
+      * Also note: only DLS_WAVE_FORMAT_PCM is currently supported, that is
-      * FormatTag must be WAVE_FORMAT_PCM. Trying to resize samples with
+      * FormatTag must be DLS_WAVE_FORMAT_PCM. Trying to resize samples with
       * other formats will fail!
       *
-      * @param iNewSize - new sample wave data size in sample points (must be
+      * @param NewSize - new sample wave data size in sample points (must be
-      *                   greater than zero)
+      *                  greater than zero)
-      * @throws DLS::Excecption if FormatTag != WAVE_FORMAT_PCM
+      * @throws DLS::Excecption if FormatTag != DLS_WAVE_FORMAT_PCM
-      *                         or if \a iNewSize is less than 1
+      * @throws DLS::Exception if \a NewSize is less than 1 or unrealistic large
       * @throws gig::Exception if existing sample is compressed
       * @see DLS::Sample::GetSize(), DLS::Sample::FrameSize,
       *      DLS::Sample::FormatTag, File::Save()
       */
-     void Sample::Resize(int iNewSize) {
+     void Sample::Resize(file_offset_t NewSize) {
          if (Compressed) throw gig::Exception("There is no support for modifying compressed samples (yet)");
-         DLS::Sample::Resize(iNewSize);
+         DLS::Sample::Resize(NewSize);
      }
      /**
-Line 673 
 namespace {
+Line 889 
 namespace {
       * @returns            the new sample position
       * @see                Read()
       */
-     unsigned long Sample::SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence) {
+     file_offset_t Sample::SetPos(file_offset_t SampleCount, RIFF::stream_whence_t Whence) {
          if (Compressed) {
              switch (Whence) {
                  case RIFF::stream_curpos:
-Line 691 
 namespace {
+Line 907 
 namespace {
              }
              if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
-             unsigned long frame = this->SamplePos / 2048; // to which frame to jump
+             file_offset_t frame = this->SamplePos / 2048; // to which frame to jump
              this->FrameOffset   = this->SamplePos % 2048; // offset (in sample points) within that frame
              pCkData->SetPos(FrameTable[frame]);           // set chunk pointer to the start of sought frame
              return this->SamplePos;
          }
          else { // not compressed
-             unsigned long orderedBytes = SampleCount * this->FrameSize;
+             file_offset_t orderedBytes = SampleCount * this->FrameSize;
-             unsigned long result = pCkData->SetPos(orderedBytes, Whence);
+             file_offset_t result = pCkData->SetPos(orderedBytes, Whence);
              return (result == orderedBytes) ? SampleCount
                                              : result / this->FrameSize;
          }
-Line 707 
 namespace {
+Line 923 
 namespace {
      /**
       * Returns the current position in the sample (in sample points).
       */
-     unsigned long Sample::GetPos() {
+     file_offset_t Sample::GetPos() const {
          if (Compressed) return SamplePos;
          else            return pCkData->GetPos() / FrameSize;
      }
-Line 746 
 namespace {
+Line 962 
 namespace {
       * @returns                number of successfully read sample points
       * @see                    CreateDecompressionBuffer()
       */
-     unsigned long Sample::ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState,
+     file_offset_t Sample::ReadAndLoop(void* pBuffer, file_offset_t SampleCount, playback_state_t* pPlaybackState,
                                        DimensionRegion* pDimRgn, buffer_t* pExternalDecompressionBuffer) {
-         unsigned long samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
+         file_offset_t samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
          uint8_t* pDst = (uint8_t*) pBuffer;
          SetPos(pPlaybackState->position); // recover position from the last time
-Line 786 
 namespace {
+Line 1002 
 namespace {
                                  // reading, swap all sample frames so it reflects
                                  // backward playback
-                                 unsigned long swapareastart       = totalreadsamples;
+                                 file_offset_t swapareastart       = totalreadsamples;
-                                 unsigned long loopoffset          = GetPos() - loop.LoopStart;
+                                 file_offset_t loopoffset          = GetPos() - loop.LoopStart;
-                                 unsigned long samplestoreadinloop = Min(samplestoread, loopoffset);
+                                 file_offset_t samplestoreadinloop = Min(samplestoread, loopoffset);
-                                 unsigned long reverseplaybackend  = GetPos() - samplestoreadinloop;
+                                 file_offset_t reverseplaybackend  = GetPos() - samplestoreadinloop;
                                  SetPos(reverseplaybackend);
-Line 809 
 namespace {
+Line 1025 
 namespace {
                                  }
                                  // reverse the sample frames for backward playback
-                                 SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
+                                 if (totalreadsamples > swapareastart) //FIXME: this if() is just a crash workaround for now (#102), but totalreadsamples <= swapareastart should never be the case, so there's probably still a bug above!
+                                     SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
                              }
                          } while (samplestoread && readsamples);
                          break;
-Line 836 
 namespace {
+Line 1053 
 namespace {
                          // reading, swap all sample frames so it reflects
                          // backward playback
-                         unsigned long swapareastart       = totalreadsamples;
+                         file_offset_t swapareastart       = totalreadsamples;
-                         unsigned long loopoffset          = GetPos() - loop.LoopStart;
+                         file_offset_t loopoffset          = GetPos() - loop.LoopStart;
-                         unsigned long samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * loop.LoopLength - loopoffset)
+                         file_offset_t samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * loop.LoopLength - loopoffset)
                                                                                    : samplestoread;
-                         unsigned long reverseplaybackend  = loop.LoopStart + Abs((loopoffset - samplestoreadinloop) % loop.LoopLength);
+                         file_offset_t reverseplaybackend  = loop.LoopStart + Abs((loopoffset - samplestoreadinloop) % loop.LoopLength);
                          SetPos(reverseplaybackend);
-Line 920 
 namespace {
+Line 1137 
 namespace {
       * @returns            number of successfully read sample points
       * @see                SetPos(), CreateDecompressionBuffer()
       */
-     unsigned long Sample::Read(void* pBuffer, unsigned long SampleCount, buffer_t* pExternalDecompressionBuffer) {
+     file_offset_t Sample::Read(void* pBuffer, file_offset_t SampleCount, buffer_t* pExternalDecompressionBuffer) {
          if (SampleCount == 0) return 0;
          if (!Compressed) {
              if (BitDepth == 24) {
-Line 935 
 namespace {
+Line 1152 
 namespace {
          else {
              if (this->SamplePos >= this->SamplesTotal) return 0;
              //TODO: efficiency: maybe we should test for an average compression rate
-             unsigned long assumedsize      = GuessSize(SampleCount),
+             file_offset_t assumedsize      = GuessSize(SampleCount),
                            remainingbytes   = 0,           // remaining bytes in the local buffer
                            remainingsamples = SampleCount,
                            copysamples, skipsamples,
-Line 958 
 namespace {
+Line 1175 
 namespace {
              remainingbytes = pCkData->Read(pSrc, assumedsize, 1);
              while (remainingsamples && remainingbytes) {
-                 unsigned long framesamples = SamplesPerFrame;
+                 file_offset_t framesamples = SamplesPerFrame;
-                 unsigned long framebytes, rightChannelOffset = 0, nextFrameOffset;
+                 file_offset_t framebytes, rightChannelOffset = 0, nextFrameOffset;
                  int mode_l = *pSrc++, mode_r = 0;
-Line 1099 
 namespace {
+Line 1316 
 namespace {
       *
       * Note: there is currently no support for writing compressed samples.
       *
+      * For 16 bit samples, the data in the source buffer should be
+      * int16_t (using native endianness). For 24 bit, the buffer
+      * should contain three bytes per sample, little-endian.
+      *
       * @param pBuffer     - source buffer
       * @param SampleCount - number of sample points to write
       * @throws DLS::Exception if current sample size is too small
       * @throws gig::Exception if sample is compressed
       * @see DLS::LoadSampleData()
       */
-     unsigned long Sample::Write(void* pBuffer, unsigned long SampleCount) {
+     file_offset_t Sample::Write(void* pBuffer, file_offset_t SampleCount) {
          if (Compressed) throw gig::Exception("There is no support for writing compressed gig samples (yet)");
-         return DLS::Sample::Write(pBuffer, SampleCount);
+         // if this is the first write in this sample, reset the
+         // checksum calculator
+         if (pCkData->GetPos() == 0) {
+             __resetCRC(crc);
+         }
+         if (GetSize() < SampleCount) throw Exception("Could not write sample data, current sample size to small");
+         file_offset_t res;
+         if (BitDepth == 24) {
+             res = pCkData->Write(pBuffer, SampleCount * FrameSize, 1) / FrameSize;
+         } else { // 16 bit
+             res = Channels == 2 ? pCkData->Write(pBuffer, SampleCount << 1, 2) >> 1
+                                 : pCkData->Write(pBuffer, SampleCount, 2);
+         }
+         __calculateCRC((unsigned char *)pBuffer, SampleCount * FrameSize, crc);
+         // if this is the last write, update the checksum chunk in the
+         // file
+         if (pCkData->GetPos() == pCkData->GetSize()) {
+             __finalizeCRC(crc);
+             File* pFile = static_cast<File*>(GetParent());
+             pFile->SetSampleChecksum(this, crc);
+         }
+         return res;
      }
      /**
-Line 1126 
 namespace {
+Line 1370 
 namespace {
       * @returns allocated decompression buffer
       * @see DestroyDecompressionBuffer()
       */
-     buffer_t Sample::CreateDecompressionBuffer(unsigned long MaxReadSize) {
+     buffer_t Sample::CreateDecompressionBuffer(file_offset_t MaxReadSize) {
          buffer_t result;
          const double worstCaseHeaderOverhead =
                  (256.0 /*frame size*/ + 12.0 /*header*/ + 2.0 /*compression type flag (stereo)*/) / 256.0;
-         result.Size              = (unsigned long) (double(MaxReadSize) * 3.0 /*(24 Bit)*/ * 2.0 /*stereo*/ * worstCaseHeaderOverhead);
+         result.Size              = (file_offset_t) (double(MaxReadSize) * 3.0 /*(24 Bit)*/ * 2.0 /*stereo*/ * worstCaseHeaderOverhead);
          result.pStart            = new int8_t[result.Size];
          result.NullExtensionSize = 0;
          return result;
-Line 1164 
 namespace {
+Line 1408 
 namespace {
          return pGroup;
      }
+     /**
+      * Returns the CRC-32 checksum of the sample's raw wave form data at the
+      * time when this sample's wave form data was modified for the last time
+      * by calling Write(). This checksum only covers the raw wave form data,
+      * not any meta informations like i.e. bit depth or loop points. Since
+      * this method just returns the checksum stored for this sample i.e. when
+      * the gig file was loaded, this method returns immediately. So it does no
+      * recalcuation of the checksum with the currently available sample wave
+      * form data.
+      *
+      * @see VerifyWaveData()
+      */
+     uint32_t Sample::GetWaveDataCRC32Checksum() {
+         return crc;
+     }
+     /**
+      * Checks the integrity of this sample's raw audio wave data. Whenever a
+      * Sample's raw wave data is intentionally modified (i.e. by calling
+      * Write() and supplying the new raw audio wave form data) a CRC32 checksum
+      * is calculated and stored/updated for this sample, along to the sample's
+      * meta informations.
+      *
+      * Now by calling this method the current raw audio wave data is checked
+      * against the already stored CRC32 check sum in order to check whether the
+      * sample data had been damaged unintentionally for some reason. Since by
+      * calling this method always the entire raw audio wave data has to be
+      * read, verifying all samples this way may take a long time accordingly.
+      * And that's also the reason why the sample integrity is not checked by
+      * default whenever a gig file is loaded. So this method must be called
+      * explicitly to fulfill this task.
+      *
+      * @param pActually - (optional) if provided, will be set to the actually
+      *                    calculated checksum of the current raw wave form data,
+      *                    you can get the expected checksum instead by calling
+      *                    GetWaveDataCRC32Checksum()
+      * @returns true if sample is OK or false if the sample is damaged
+      * @throws Exception if no checksum had been stored to disk for this
+      *         sample yet, or on I/O issues
+      * @see GetWaveDataCRC32Checksum()
+      */
+     bool Sample::VerifyWaveData(uint32_t* pActually) {
+         //File* pFile = static_cast<File*>(GetParent());
+         uint32_t crc = CalculateWaveDataChecksum();
+         if (pActually) *pActually = crc;
+         return crc == this->crc;
+     }
+     uint32_t Sample::CalculateWaveDataChecksum() {
+         const size_t sz = 20*1024; // 20kB buffer size
+         std::vector<uint8_t> buffer(sz);
+         buffer.resize(sz);
+         const size_t n = sz / FrameSize;
+         SetPos(0);
+         uint32_t crc = 0;
+         __resetCRC(crc);
+         while (true) {
+             file_offset_t nRead = Read(&buffer[0], n);
+             if (nRead <= 0) break;
+             __calculateCRC(&buffer[0], nRead * FrameSize, crc);
+         }
+         __finalizeCRC(crc);
+         return crc;
+     }
      Sample::~Sample() {
          Instances--;
          if (!Instances && InternalDecompressionBuffer.Size) {
-Line 1180 
 namespace {
+Line 1490 
 namespace {
  // *************** DimensionRegion ***************
  // *
-     uint                               DimensionRegion::Instances       = 0;
+     size_t                             DimensionRegion::Instances       = 0;
      DimensionRegion::VelocityTableMap* DimensionRegion::pVelocityTables = NULL;
-     DimensionRegion::DimensionRegion(RIFF::List* _3ewl) : DLS::Sampler(_3ewl) {
+     DimensionRegion::DimensionRegion(Region* pParent, RIFF::List* _3ewl) : DLS::Sampler(_3ewl) {
          Instances++;
          pSample = NULL;
+         pRegion = pParent;
+         if (_3ewl->GetSubChunk(CHUNK_ID_WSMP)) memcpy(&Crossfade, &SamplerOptions, 4);
+         else memset(&Crossfade, 0, 4);
-         memcpy(&Crossfade, &SamplerOptions, 4);
          if (!pVelocityTables) pVelocityTables = new VelocityTableMap;
          RIFF::Chunk* _3ewa = _3ewl->GetSubChunk(CHUNK_ID_3EWA);
          if (_3ewa) { // if '3ewa' chunk exists
+             _3ewa->SetPos(0);
              _3ewa->ReadInt32(); // unknown, always == chunk size ?
              LFO3Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
              EG3Attack     = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
-Line 1302 
 namespace {
+Line 1617 
 namespace {
                                                          : vcf_res_ctrl_none;
              uint16_t eg3depth = _3ewa->ReadUint16();
              EG3Depth = (eg3depth <= 1200) ? eg3depth /* positives */
-                                         : (-1) * (int16_t) ((eg3depth ^ 0xffff) + 1); /* binary complementary for negatives */
+                                         : (-1) * (int16_t) ((eg3depth ^ 0xfff) + 1); /* binary complementary for negatives */
              _3ewa->ReadInt16(); // unknown
              ChannelOffset = _3ewa->ReadUint8() / 4;
              uint8_t regoptions = _3ewa->ReadUint8();
-Line 1338 
 namespace {
+Line 1653 
 namespace {
                  if (lfo3ctrl & 0x40) // bit 6
                      VCFType = vcf_type_lowpassturbo;
              }
+             if (_3ewa->RemainingBytes() >= 8) {
+                 _3ewa->Read(DimensionUpperLimits, 1, 8);
+             } else {
+                 memset(DimensionUpperLimits, 0, 8);
+             }
          } else { // '3ewa' chunk does not exist yet
              // use default values
              LFO3Frequency                   = 1.0;
-Line 1347 
 namespace {
+Line 1667 
 namespace {
              LFO1ControlDepth                = 0;
              LFO3ControlDepth                = 0;
              EG1Attack                       = 0.0;
-             EG1Decay1                       = 0.0;
+             EG1Decay1                       = 0.005;
-             EG1Sustain                      = 0;
+             EG1Sustain                      = 1000;
-             EG1Release                      = 0.0;
+             EG1Release                      = 0.3;
              EG1Controller.type              = eg1_ctrl_t::type_none;
              EG1Controller.controller_number = 0;
              EG1ControllerInvert             = false;
-Line 1364 
 namespace {
+Line 1684 
 namespace {
              EG2ControllerReleaseInfluence   = 0;
              LFO1Frequency                   = 1.0;
              EG2Attack                       = 0.0;
-             EG2Decay1                       = 0.0;
+             EG2Decay1                       = 0.005;
-             EG2Sustain                      = 0;
+             EG2Sustain                      = 1000;
-             EG2Release                      = 0.0;
+             EG2Release                      = 60;
              LFO2ControlDepth                = 0;
              LFO2Frequency                   = 1.0;
              LFO2InternalDepth               = 0;
              EG1Decay2                       = 0.0;
-             EG1InfiniteSustain              = false;
+             EG1InfiniteSustain              = true;
-             EG1PreAttack                    = 1000;
+             EG1PreAttack                    = 0;
              EG2Decay2                       = 0.0;
-             EG2InfiniteSustain              = false;
+             EG2InfiniteSustain              = true;
-             EG2PreAttack                    = 1000;
+             EG2PreAttack                    = 0;
              VelocityResponseCurve           = curve_type_nonlinear;
              VelocityResponseDepth           = 3;
              ReleaseVelocityResponseCurve    = curve_type_nonlinear;
-Line 1418 
 namespace {
+Line 1738 
 namespace {
              VCFVelocityDynamicRange         = 0x04;
              VCFVelocityCurve                = curve_type_linear;
              VCFType                         = vcf_type_lowpass;
+             memset(DimensionUpperLimits, 127, 8);
+         }
+         // chunk for own format extensions, these will *NOT* work with Gigasampler/GigaStudio !
+         RIFF::Chunk* lsde = _3ewl->GetSubChunk(CHUNK_ID_LSDE);
+         if (lsde) { // format extension for EG behavior options
+             lsde->SetPos(0);
+             eg_opt_t* pEGOpts[2] = { &EG1Options, &EG2Options };
+             for (int i = 0; i < 2; ++i) { // NOTE: we reserved a 3rd byte for a potential future EG3 option
+                 unsigned char byte = lsde->ReadUint8();
+                 pEGOpts[i]->AttackCancel     = byte & 1;
+                 pEGOpts[i]->AttackHoldCancel = byte & (1 << 1);
+                 pEGOpts[i]->Decay1Cancel     = byte & (1 << 2);
+                 pEGOpts[i]->Decay2Cancel     = byte & (1 << 3);
+                 pEGOpts[i]->ReleaseCancel    = byte & (1 << 4);
+             }
+         }
+         // format extension for sustain pedal up effect on release trigger samples
+         if (lsde && lsde->GetSize() > 3) { // NOTE: we reserved the 3rd byte for a potential future EG3 option
+             lsde->SetPos(3);
+             uint8_t byte = lsde->ReadUint8();
+             SustainReleaseTrigger   = static_cast<sust_rel_trg_t>(byte & 0x03);
+             NoNoteOffReleaseTrigger = byte >> 7;
+         } else {
+             SustainReleaseTrigger   = sust_rel_trg_none;
+             NoNoteOffReleaseTrigger = false;
+         }
+         // format extension for LFOs' wave form, phase displacement and for
+         // LFO3's flip phase
+         if (lsde && lsde->GetSize() > 4) {
+             lsde->SetPos(4);
+             LFO1WaveForm = static_cast<lfo_wave_t>( lsde->ReadUint16() );
+             LFO2WaveForm = static_cast<lfo_wave_t>( lsde->ReadUint16() );
+             LFO3WaveForm = static_cast<lfo_wave_t>( lsde->ReadUint16() );
+             lsde->ReadUint16(); // unused 16 bits, reserved for potential future use
+             LFO1Phase = (double) GIG_EXP_DECODE( lsde->ReadInt32() );
+             LFO2Phase = (double) GIG_EXP_DECODE( lsde->ReadInt32() );
+             LFO3Phase = (double) GIG_EXP_DECODE( lsde->ReadInt32() );
+             const uint32_t flags = lsde->ReadInt32();
+             LFO3FlipPhase = flags & 1;
+         } else {
+             LFO1WaveForm = lfo_wave_sine;
+             LFO2WaveForm = lfo_wave_sine;
+             LFO3WaveForm = lfo_wave_sine;
+             LFO1Phase = 0.0;
+             LFO2Phase = 0.0;
+             LFO3Phase = 0.0;
+             LFO3FlipPhase = false;
          }
          pVelocityAttenuationTable = GetVelocityTable(VelocityResponseCurve,
                                                       VelocityResponseDepth,
                                                       VelocityResponseCurveScaling);
-         curve_type_t curveType = ReleaseVelocityResponseCurve;
+         pVelocityReleaseTable = GetReleaseVelocityTable(
-         uint8_t depth = ReleaseVelocityResponseDepth;
+                                     ReleaseVelocityResponseCurve,
+                                     ReleaseVelocityResponseDepth
+                                 );
+         pVelocityCutoffTable = GetCutoffVelocityTable(VCFVelocityCurve,
+                                                       VCFVelocityDynamicRange,
+                                                       VCFVelocityScale,
+                                                       VCFCutoffController);
-         // this models a strange behaviour or bug in GSt: two of the
+         SampleAttenuation = pow(10.0, -Gain / (20.0 * 655360));
-         // velocity response curves for release time are not used even
+         VelocityTable = 0;
-         // if specified, instead another curve is chosen.
+     }
-         if ((curveType == curve_type_nonlinear && depth == 0) ||
-             (curveType == curve_type_special   && depth == 4)) {
-             curveType = curve_type_nonlinear;
-             depth = 3;
-         }
-         pVelocityReleaseTable = GetVelocityTable(curveType, depth, 0);
-         curveType = VCFVelocityCurve;
-         depth = VCFVelocityDynamicRange;
-         // even stranger GSt: two of the velocity response curves for
+     /*
-         // filter cutoff are not used, instead another special curve
+      * Constructs a DimensionRegion by copying all parameters from
-         // is chosen. This curve is not used anywhere else.
+      * another DimensionRegion
-         if ((curveType == curve_type_nonlinear && depth == 0) ||
+      */
-             (curveType == curve_type_special   && depth == 4)) {
+     DimensionRegion::DimensionRegion(RIFF::List* _3ewl, const DimensionRegion& src) : DLS::Sampler(_3ewl) {
-             curveType = curve_type_special;
+         Instances++;
-             depth = 5;
+         //NOTE: I think we cannot call CopyAssign() here (in a constructor) as long as its a virtual method
+         *this = src; // default memberwise shallow copy of all parameters
+         pParentList = _3ewl; // restore the chunk pointer
+         // deep copy of owned structures
+         if (src.VelocityTable) {
+             VelocityTable = new uint8_t[128];
+             for (int k = 0 ; k < 128 ; k++)
+                 VelocityTable[k] = src.VelocityTable[k];
+         }
+         if (src.pSampleLoops) {
+             pSampleLoops = new DLS::sample_loop_t[src.SampleLoops];
+             for (int k = 0 ; k < src.SampleLoops ; k++)
+                 pSampleLoops[k] = src.pSampleLoops[k];
          }
-         pVelocityCutoffTable = GetVelocityTable(curveType, depth,
+     }
-                                                 VCFCutoffController <= vcf_cutoff_ctrl_none2 ? VCFVelocityScale : 0);
+     /**
+      * Make a (semi) deep copy of the DimensionRegion object given by @a orig
+      * and assign it to this object.
+      *
+      * Note that all sample pointers referenced by @a orig are simply copied as
+      * memory address. Thus the respective samples are shared, not duplicated!
+      *
+      * @param orig - original DimensionRegion object to be copied from
+      */
+     void DimensionRegion::CopyAssign(const DimensionRegion* orig) {
+         CopyAssign(orig, NULL);
+     }
+     /**
+      * Make a (semi) deep copy of the DimensionRegion object given by @a orig
+      * and assign it to this object.
+      *
+      * @param orig - original DimensionRegion object to be copied from
+      * @param mSamples - crosslink map between the foreign file's samples and
+      *                   this file's samples
+      */
+     void DimensionRegion::CopyAssign(const DimensionRegion* orig, const std::map<Sample*,Sample*>* mSamples) {
+         // delete all allocated data first
+         if (VelocityTable) delete [] VelocityTable;
+         if (pSampleLoops) delete [] pSampleLoops;
+         // backup parent list pointer
+         RIFF::List* p = pParentList;
+         gig::Sample* pOriginalSample = pSample;
+         gig::Region* pOriginalRegion = pRegion;
+         //NOTE: copy code copied from assignment constructor above, see comment there as well
+         *this = *orig; // default memberwise shallow copy of all parameters
+         // restore members that shall not be altered
+         pParentList = p; // restore the chunk pointer
+         pRegion = pOriginalRegion;
+         // only take the raw sample reference reference if the
+         // two DimensionRegion objects are part of the same file
+         if (pOriginalRegion->GetParent()->GetParent() != orig->pRegion->GetParent()->GetParent()) {
+             pSample = pOriginalSample;
+         }
+         if (mSamples && mSamples->count(orig->pSample)) {
+             pSample = mSamples->find(orig->pSample)->second;
+         }
+         // deep copy of owned structures
+         if (orig->VelocityTable) {
+             VelocityTable = new uint8_t[128];
+             for (int k = 0 ; k < 128 ; k++)
+                 VelocityTable[k] = orig->VelocityTable[k];
+         }
+         if (orig->pSampleLoops) {
+             pSampleLoops = new DLS::sample_loop_t[orig->SampleLoops];
+             for (int k = 0 ; k < orig->SampleLoops ; k++)
+                 pSampleLoops[k] = orig->pSampleLoops[k];
+         }
+     }
+     void DimensionRegion::serialize(Serialization::Archive* archive) {
+         // in case this class will become backward incompatible one day,
+         // then set a version and minimum version for this class like:
+         //archive->setVersion(*this, 2);
+         //archive->setMinVersion(*this, 1);
+         SRLZ(VelocityUpperLimit);
+         SRLZ(EG1PreAttack);
+         SRLZ(EG1Attack);
+         SRLZ(EG1Decay1);
+         SRLZ(EG1Decay2);
+         SRLZ(EG1InfiniteSustain);
+         SRLZ(EG1Sustain);
+         SRLZ(EG1Release);
+         SRLZ(EG1Hold);
+         SRLZ(EG1Controller);
+         SRLZ(EG1ControllerInvert);
+         SRLZ(EG1ControllerAttackInfluence);
+         SRLZ(EG1ControllerDecayInfluence);
+         SRLZ(EG1ControllerReleaseInfluence);
+         SRLZ(LFO1WaveForm);
+         SRLZ(LFO1Frequency);
+         SRLZ(LFO1Phase);
+         SRLZ(LFO1InternalDepth);
+         SRLZ(LFO1ControlDepth);
+         SRLZ(LFO1Controller);
+         SRLZ(LFO1FlipPhase);
+         SRLZ(LFO1Sync);
+         SRLZ(EG2PreAttack);
+         SRLZ(EG2Attack);
+         SRLZ(EG2Decay1);
+         SRLZ(EG2Decay2);
+         SRLZ(EG2InfiniteSustain);
+         SRLZ(EG2Sustain);
+         SRLZ(EG2Release);
+         SRLZ(EG2Controller);
+         SRLZ(EG2ControllerInvert);
+         SRLZ(EG2ControllerAttackInfluence);
+         SRLZ(EG2ControllerDecayInfluence);
+         SRLZ(EG2ControllerReleaseInfluence);
+         SRLZ(LFO2WaveForm);
+         SRLZ(LFO2Frequency);
+         SRLZ(LFO2Phase);
+         SRLZ(LFO2InternalDepth);
+         SRLZ(LFO2ControlDepth);
+         SRLZ(LFO2Controller);
+         SRLZ(LFO2FlipPhase);
+         SRLZ(LFO2Sync);
+         SRLZ(EG3Attack);
+         SRLZ(EG3Depth);
+         SRLZ(LFO3WaveForm);
+         SRLZ(LFO3Frequency);
+         SRLZ(LFO3Phase);
+         SRLZ(LFO3InternalDepth);
+         SRLZ(LFO3ControlDepth);
+         SRLZ(LFO3Controller);
+         SRLZ(LFO3FlipPhase);
+         SRLZ(LFO3Sync);
+         SRLZ(VCFEnabled);
+         SRLZ(VCFType);
+         SRLZ(VCFCutoffController);
+         SRLZ(VCFCutoffControllerInvert);
+         SRLZ(VCFCutoff);
+         SRLZ(VCFVelocityCurve);
+         SRLZ(VCFVelocityScale);
+         SRLZ(VCFVelocityDynamicRange);
+         SRLZ(VCFResonance);
+         SRLZ(VCFResonanceDynamic);
+         SRLZ(VCFResonanceController);
+         SRLZ(VCFKeyboardTracking);
+         SRLZ(VCFKeyboardTrackingBreakpoint);
+         SRLZ(VelocityResponseCurve);
+         SRLZ(VelocityResponseDepth);
+         SRLZ(VelocityResponseCurveScaling);
+         SRLZ(ReleaseVelocityResponseCurve);
+         SRLZ(ReleaseVelocityResponseDepth);
+         SRLZ(ReleaseTriggerDecay);
+         SRLZ(Crossfade);
+         SRLZ(PitchTrack);
+         SRLZ(DimensionBypass);
+         SRLZ(Pan);
+         SRLZ(SelfMask);
+         SRLZ(AttenuationController);
+         SRLZ(InvertAttenuationController);
+         SRLZ(AttenuationControllerThreshold);
+         SRLZ(ChannelOffset);
+         SRLZ(SustainDefeat);
+         SRLZ(MSDecode);
+         //SRLZ(SampleStartOffset);
+         SRLZ(SampleAttenuation);
+         SRLZ(EG1Options);
+         SRLZ(EG2Options);
+         SRLZ(SustainReleaseTrigger);
+         SRLZ(NoNoteOffReleaseTrigger);
+         // derived attributes from DLS::Sampler
+         SRLZ(FineTune);
+         SRLZ(Gain);
+     }
+     /**
+      * Updates the respective member variable and updates @c SampleAttenuation
+      * which depends on this value.
+      */
+     void DimensionRegion::SetGain(int32_t gain) {
+         DLS::Sampler::SetGain(gain);
          SampleAttenuation = pow(10.0, -Gain / (20.0 * 655360));
-         VelocityTable = 0;
      }
      /**
-Line 1461 
 namespace {
+Line 2008 
 namespace {
       *
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
       */
-     void DimensionRegion::UpdateChunks() {
+     void DimensionRegion::UpdateChunks(progress_t* pProgress) {
          // first update base class's chunk
-         DLS::Sampler::UpdateChunks();
+         DLS::Sampler::UpdateChunks(pProgress);
+         RIFF::Chunk* wsmp = pParentList->GetSubChunk(CHUNK_ID_WSMP);
+         uint8_t* pData = (uint8_t*) wsmp->LoadChunkData();
+         pData[12] = Crossfade.in_start;
+         pData[13] = Crossfade.in_end;
+         pData[14] = Crossfade.out_start;
+         pData[15] = Crossfade.out_end;
          // make sure '3ewa' chunk exists
          RIFF::Chunk* _3ewa = pParentList->GetSubChunk(CHUNK_ID_3EWA);
-         if (!_3ewa)  _3ewa = pParentList->AddSubChunk(CHUNK_ID_3EWA, 140);
+         if (!_3ewa) {
-         uint8_t* pData = (uint8_t*) _3ewa->LoadChunkData();
+             File* pFile = (File*) GetParent()->GetParent()->GetParent();
+             bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
+             _3ewa = pParentList->AddSubChunk(CHUNK_ID_3EWA, versiongt2 ? 148 : 140);
+         }
+         pData = (uint8_t*) _3ewa->LoadChunkData();
          // update '3ewa' chunk with DimensionRegion's current settings
-         const uint32_t unknown = _3ewa->GetSize(); // unknown, always chunk size ?
+         const uint32_t chunksize = (uint32_t) _3ewa->GetNewSize();
-         memcpy(&pData[0], &unknown, 4);
+         store32(&pData[0], chunksize); // unknown, always chunk size?
          const int32_t lfo3freq = (int32_t) GIG_EXP_ENCODE(LFO3Frequency);
-         memcpy(&pData[4], &lfo3freq, 4);
+         store32(&pData[4], lfo3freq);
          const int32_t eg3attack = (int32_t) GIG_EXP_ENCODE(EG3Attack);
-         memcpy(&pData[8], &eg3attack, 4);
+         store32(&pData[8], eg3attack);
          // next 2 bytes unknown
-         memcpy(&pData[14], &LFO1InternalDepth, 2);
+         store16(&pData[14], LFO1InternalDepth);
          // next 2 bytes unknown
-         memcpy(&pData[18], &LFO3InternalDepth, 2);
+         store16(&pData[18], LFO3InternalDepth);
          // next 2 bytes unknown
-         memcpy(&pData[22], &LFO1ControlDepth, 2);
+         store16(&pData[22], LFO1ControlDepth);
          // next 2 bytes unknown
-         memcpy(&pData[26], &LFO3ControlDepth, 2);
+         store16(&pData[26], LFO3ControlDepth);
          const int32_t eg1attack = (int32_t) GIG_EXP_ENCODE(EG1Attack);
-         memcpy(&pData[28], &eg1attack, 4);
+         store32(&pData[28], eg1attack);
          const int32_t eg1decay1 = (int32_t) GIG_EXP_ENCODE(EG1Decay1);
-         memcpy(&pData[32], &eg1decay1, 4);
+         store32(&pData[32], eg1decay1);
          // next 2 bytes unknown
-         memcpy(&pData[38], &EG1Sustain, 2);
+         store16(&pData[38], EG1Sustain);
          const int32_t eg1release = (int32_t) GIG_EXP_ENCODE(EG1Release);
-         memcpy(&pData[40], &eg1release, 4);
+         store32(&pData[40], eg1release);
          const uint8_t eg1ctl = (uint8_t) EncodeLeverageController(EG1Controller);
-         memcpy(&pData[44], &eg1ctl, 1);
+         pData[44] = eg1ctl;
          const uint8_t eg1ctrloptions =
-             (EG1ControllerInvert) ? 0x01 : 0x00 |
+             (EG1ControllerInvert ? 0x01 : 0x00) |
              GIG_EG_CTR_ATTACK_INFLUENCE_ENCODE(EG1ControllerAttackInfluence) |
              GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(EG1ControllerDecayInfluence) |
              GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(EG1ControllerReleaseInfluence);
-         memcpy(&pData[45], &eg1ctrloptions, 1);
+         pData[45] = eg1ctrloptions;
          const uint8_t eg2ctl = (uint8_t) EncodeLeverageController(EG2Controller);
-         memcpy(&pData[46], &eg2ctl, 1);
+         pData[46] = eg2ctl;
          const uint8_t eg2ctrloptions =
-             (EG2ControllerInvert) ? 0x01 : 0x00 |
+             (EG2ControllerInvert ? 0x01 : 0x00) |
              GIG_EG_CTR_ATTACK_INFLUENCE_ENCODE(EG2ControllerAttackInfluence) |
              GIG_EG_CTR_DECAY_INFLUENCE_ENCODE(EG2ControllerDecayInfluence) |
              GIG_EG_CTR_RELEASE_INFLUENCE_ENCODE(EG2ControllerReleaseInfluence);
-         memcpy(&pData[47], &eg2ctrloptions, 1);
+         pData[47] = eg2ctrloptions;
          const int32_t lfo1freq = (int32_t) GIG_EXP_ENCODE(LFO1Frequency);
-         memcpy(&pData[48], &lfo1freq, 4);
+         store32(&pData[48], lfo1freq);
          const int32_t eg2attack = (int32_t) GIG_EXP_ENCODE(EG2Attack);
-         memcpy(&pData[52], &eg2attack, 4);
+         store32(&pData[52], eg2attack);
          const int32_t eg2decay1 = (int32_t) GIG_EXP_ENCODE(EG2Decay1);
-         memcpy(&pData[56], &eg2decay1, 4);
+         store32(&pData[56], eg2decay1);
          // next 2 bytes unknown
-         memcpy(&pData[62], &EG2Sustain, 2);
+         store16(&pData[62], EG2Sustain);
          const int32_t eg2release = (int32_t) GIG_EXP_ENCODE(EG2Release);
-         memcpy(&pData[64], &eg2release, 4);
+         store32(&pData[64], eg2release);
          // next 2 bytes unknown
-         memcpy(&pData[70], &LFO2ControlDepth, 2);
+         store16(&pData[70], LFO2ControlDepth);
          const int32_t lfo2freq = (int32_t) GIG_EXP_ENCODE(LFO2Frequency);
-         memcpy(&pData[72], &lfo2freq, 4);
+         store32(&pData[72], lfo2freq);
          // next 2 bytes unknown
-         memcpy(&pData[78], &LFO2InternalDepth, 2);
+         store16(&pData[78], LFO2InternalDepth);
          const int32_t eg1decay2 = (int32_t) (EG1InfiniteSustain) ? 0x7fffffff : (int32_t) GIG_EXP_ENCODE(EG1Decay2);
-         memcpy(&pData[80], &eg1decay2, 4);
+         store32(&pData[80], eg1decay2);
          // next 2 bytes unknown
-         memcpy(&pData[86], &EG1PreAttack, 2);
+         store16(&pData[86], EG1PreAttack);
          const int32_t eg2decay2 = (int32_t) (EG2InfiniteSustain) ? 0x7fffffff : (int32_t) GIG_EXP_ENCODE(EG2Decay2);
-         memcpy(&pData[88], &eg2decay2, 4);
+         store32(&pData[88], eg2decay2);
          // next 2 bytes unknown
-         memcpy(&pData[94], &EG2PreAttack, 2);
+         store16(&pData[94], EG2PreAttack);
          {
              if (VelocityResponseDepth > 4) throw Exception("VelocityResponseDepth must be between 0 and 4");
-Line 1588 
 namespace {
+Line 2148 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown VelocityResponseCurve selected");
              }
-             memcpy(&pData[96], &velocityresponse, 1);
+             pData[96] = velocityresponse;
          }
          {
-Line 1607 
 namespace {
+Line 2167 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown ReleaseVelocityResponseCurve selected");
              }
-             memcpy(&pData[97], &releasevelocityresponse, 1);
+             pData[97] = releasevelocityresponse;
          }
-         memcpy(&pData[98], &VelocityResponseCurveScaling, 1);
+         pData[98] = VelocityResponseCurveScaling;
-         memcpy(&pData[99], &AttenuationControllerThreshold, 1);
+         pData[99] = AttenuationControllerThreshold;
          // next 4 bytes unknown
-         memcpy(&pData[104], &SampleStartOffset, 2);
+         store16(&pData[104], SampleStartOffset);
          // next 2 bytes unknown
-Line 1635 
 namespace {
+Line 2195 
 namespace {
                  default:
                      throw Exception("Could not update DimensionRegion's chunk, unknown DimensionBypass selected");
              }
-             memcpy(&pData[108], &pitchTrackDimensionBypass, 1);
+             pData[108] = pitchTrackDimensionBypass;
          }
          const uint8_t pan = (Pan >= 0) ? Pan : ((-Pan) + 63); // signed 8 bit -> signed 7 bit
-         memcpy(&pData[109], &pan, 1);
+         pData[109] = pan;
          const uint8_t selfmask = (SelfMask) ? 0x01 : 0x00;
-         memcpy(&pData[110], &selfmask, 1);
+         pData[110] = selfmask;
          // next byte unknown
-Line 1651 
 namespace {
+Line 2211 
 namespace {
              if (LFO3Sync) lfo3ctrl |= 0x20; // bit 5
              if (InvertAttenuationController) lfo3ctrl |= 0x80; // bit 7
              if (VCFType == vcf_type_lowpassturbo) lfo3ctrl |= 0x40; // bit 6
-             memcpy(&pData[112], &lfo3ctrl, 1);
+             pData[112] = lfo3ctrl;
          }
          const uint8_t attenctl = EncodeLeverageController(AttenuationController);
-         memcpy(&pData[113], &attenctl, 1);
+         pData[113] = attenctl;
          {
              uint8_t lfo2ctrl = LFO2Controller & 0x07; // lower 3 bits
              if (LFO2FlipPhase) lfo2ctrl |= 0x80; // bit 7
              if (LFO2Sync)      lfo2ctrl |= 0x20; // bit 5
              if (VCFResonanceController != vcf_res_ctrl_none) lfo2ctrl |= 0x40; // bit 6
-             memcpy(&pData[114], &lfo2ctrl, 1);
+             pData[114] = lfo2ctrl;
          }
          {
-Line 1671 
 namespace {
+Line 2231 
 namespace {
              if (LFO1Sync)      lfo1ctrl |= 0x40; // bit 6
              if (VCFResonanceController != vcf_res_ctrl_none)
                  lfo1ctrl |= GIG_VCF_RESONANCE_CTRL_ENCODE(VCFResonanceController);
-             memcpy(&pData[115], &lfo1ctrl, 1);
+             pData[115] = lfo1ctrl;
          }
          const uint16_t eg3depth = (EG3Depth >= 0) ? EG3Depth
-                                                   : uint16_t(((-EG3Depth) - 1) ^ 0xffff); /* binary complementary for negatives */
+                                                   : uint16_t(((-EG3Depth) - 1) ^ 0xfff); /* binary complementary for negatives */
-         memcpy(&pData[116], &eg3depth, 1);
+         store16(&pData[116], eg3depth);
          // next 2 bytes unknown
          const uint8_t channeloffset = ChannelOffset * 4;
-         memcpy(&pData[120], &channeloffset, 1);
+         pData[120] = channeloffset;
          {
              uint8_t regoptions = 0;
              if (MSDecode)      regoptions |= 0x01; // bit 0
              if (SustainDefeat) regoptions |= 0x02; // bit 1
-             memcpy(&pData[121], &regoptions, 1);
+             pData[121] = regoptions;
          }
          // next 2 bytes unknown
-         memcpy(&pData[124], &VelocityUpperLimit, 1);
+         pData[124] = VelocityUpperLimit;
          // next 3 bytes unknown
-         memcpy(&pData[128], &ReleaseTriggerDecay, 1);
+         pData[128] = ReleaseTriggerDecay;
          // next 2 bytes unknown
          const uint8_t eg1hold = (EG1Hold) ? 0x80 : 0x00; // bit 7
-         memcpy(&pData[131], &eg1hold, 1);
+         pData[131] = eg1hold;
-         const uint8_t vcfcutoff = (VCFEnabled) ? 0x80 : 0x00 |  /* bit 7 */
+         const uint8_t vcfcutoff = (VCFEnabled ? 0x80 : 0x00) |  /* bit 7 */
                                    (VCFCutoff & 0x7f);   /* lower 7 bits */
-         memcpy(&pData[132], &vcfcutoff, 1);
+         pData[132] = vcfcutoff;
-         memcpy(&pData[133], &VCFCutoffController, 1);
+         pData[133] = VCFCutoffController;
-         const uint8_t vcfvelscale = (VCFCutoffControllerInvert) ? 0x80 : 0x00 | /* bit 7 */
+         const uint8_t vcfvelscale = (VCFCutoffControllerInvert ? 0x80 : 0x00) | /* bit 7 */
                                      (VCFVelocityScale & 0x7f); /* lower 7 bits */
-         memcpy(&pData[134], &vcfvelscale, 1);
+         pData[134] = vcfvelscale;
          // next byte unknown
-         const uint8_t vcfresonance = (VCFResonanceDynamic) ? 0x00 : 0x80 | /* bit 7 */
+         const uint8_t vcfresonance = (VCFResonanceDynamic ? 0x00 : 0x80) | /* bit 7 */
                                       (VCFResonance & 0x7f); /* lower 7 bits */
-         memcpy(&pData[136], &vcfresonance, 1);
+         pData[136] = vcfresonance;
-         const uint8_t vcfbreakpoint = (VCFKeyboardTracking) ? 0x80 : 0x00 | /* bit 7 */
+         const uint8_t vcfbreakpoint = (VCFKeyboardTracking ? 0x80 : 0x00) | /* bit 7 */
                                        (VCFKeyboardTrackingBreakpoint & 0x7f); /* lower 7 bits */
-         memcpy(&pData[137], &vcfbreakpoint, 1);
+         pData[137] = vcfbreakpoint;
-         const uint8_t vcfvelocity = VCFVelocityDynamicRange % 5 |
+         const uint8_t vcfvelocity = VCFVelocityDynamicRange % 5 +
                                      VCFVelocityCurve * 5;
-         memcpy(&pData[138], &vcfvelocity, 1);
+         pData[138] = vcfvelocity;
          const uint8_t vcftype = (VCFType == vcf_type_lowpassturbo) ? vcf_type_lowpass : VCFType;
-         memcpy(&pData[139], &vcftype, 1);
+         pData[139] = vcftype;
+         if (chunksize >= 148) {
+             memcpy(&pData[140], DimensionUpperLimits, 8);
+         }
+         // chunk for own format extensions, these will *NOT* work with
+         // Gigasampler/GigaStudio !
+         RIFF::Chunk* lsde = pParentList->GetSubChunk(CHUNK_ID_LSDE);
+         const int lsdeSize =
+/* EG cancel options */ +
+/* sustain pedal up on release trigger option */ +
+/* LFOs' wave forms */ + 12 /* LFOs' phase */ + 4 /* flags (LFO3FlipPhase) */;
+         if (!lsde && UsesAnyGigFormatExtension()) {
+             // only add this "LSDE" chunk if there is some (format extension)
+             // setting effective that would require our "LSDE" format extension
+             // chunk to be stored
+             lsde = pParentList->AddSubChunk(CHUNK_ID_LSDE, lsdeSize);
+             // move LSDE chunk to the end of parent list
+             pParentList->MoveSubChunk(lsde, (RIFF::Chunk*)NULL);
+         }
+         if (lsde) {
+             if (lsde->GetNewSize() < lsdeSize)
+                 lsde->Resize(lsdeSize);
+             // format extension for EG behavior options
+             unsigned char* pData = (unsigned char*) lsde->LoadChunkData();
+             eg_opt_t* pEGOpts[2] = { &EG1Options, &EG2Options };
+             for (int i = 0; i < 2; ++i) { // NOTE: we reserved the 3rd byte for a potential future EG3 option
+                 pData[i] =
+                     (pEGOpts[i]->AttackCancel     ? 1 : 0) |
+                     (pEGOpts[i]->AttackHoldCancel ? (1<<1) : 0) |
+                     (pEGOpts[i]->Decay1Cancel     ? (1<<2) : 0) |
+                     (pEGOpts[i]->Decay2Cancel     ? (1<<3) : 0) |
+                     (pEGOpts[i]->ReleaseCancel    ? (1<<4) : 0);
+             }
+             // format extension for release trigger options
+             pData[3] = static_cast<uint8_t>(SustainReleaseTrigger) | (NoNoteOffReleaseTrigger ? (1<<7) : 0);
+             // format extension for LFOs' wave form, phase displacement and for
+             // LFO3's flip phase
+             store16(&pData[4], LFO1WaveForm);
+             store16(&pData[6], LFO2WaveForm);
+             store16(&pData[8], LFO3WaveForm);
+             //NOTE: 16 bits reserved here for potential future use !
+             const int32_t lfo1Phase = (int32_t) GIG_EXP_ENCODE(LFO1Phase);
+             const int32_t lfo2Phase = (int32_t) GIG_EXP_ENCODE(LFO2Phase);
+             const int32_t lfo3Phase = (int32_t) GIG_EXP_ENCODE(LFO3Phase);
+             store32(&pData[12], lfo1Phase);
+             store32(&pData[16], lfo2Phase);
+             store32(&pData[20], lfo3Phase);
+             const int32_t flags = LFO3FlipPhase ? 1 : 0;
+             store32(&pData[24], flags);
+             // compile time sanity check: is our last store access here
+             // consistent with the initial lsdeSize value assignment?
+             static_assert(lsdeSize == 28, "Inconsistency in assumed 'LSDE' RIFF chunk size");
+         }
+     }
+     /**
+      * Returns @c true in case this DimensionRegion object uses any gig format
+      * extension, that is whether this DimensionRegion object currently has any
+      * setting effective that would require our "LSDE" RIFF chunk to be stored
+      * to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any
+      * format extension being used. Right now this method really just serves to
+      * answer the question whether an LSDE chunk is required, for the public API
+      * purpose this method would also need to check whether any other setting
+      * stored to the regular value '3ewa' chunk, is actually a format extension
+      * as well.
+      */
+     bool DimensionRegion::UsesAnyGigFormatExtension() const {
+         eg_opt_t defaultOpt;
+         return memcmp(&EG1Options, &defaultOpt, sizeof(eg_opt_t)) ||
+                memcmp(&EG2Options, &defaultOpt, sizeof(eg_opt_t)) ||
+                SustainReleaseTrigger || NoNoteOffReleaseTrigger ||
+                LFO1WaveForm || LFO2WaveForm || LFO3WaveForm ||
+                LFO1Phase || LFO2Phase || LFO3Phase ||
+                LFO3FlipPhase;
+     }
+     double* DimensionRegion::GetReleaseVelocityTable(curve_type_t releaseVelocityResponseCurve, uint8_t releaseVelocityResponseDepth) {
+         curve_type_t curveType = releaseVelocityResponseCurve;
+         uint8_t depth = releaseVelocityResponseDepth;
+         // this models a strange behaviour or bug in GSt: two of the
+         // velocity response curves for release time are not used even
+         // if specified, instead another curve is chosen.
+         if ((curveType == curve_type_nonlinear && depth == 0) ||
+             (curveType == curve_type_special   && depth == 4)) {
+             curveType = curve_type_nonlinear;
+             depth = 3;
+         }
+         return GetVelocityTable(curveType, depth, 0);
+     }
+     double* DimensionRegion::GetCutoffVelocityTable(curve_type_t vcfVelocityCurve,
+                                                     uint8_t vcfVelocityDynamicRange,
+                                                     uint8_t vcfVelocityScale,
+                                                     vcf_cutoff_ctrl_t vcfCutoffController)
+     {
+         curve_type_t curveType = vcfVelocityCurve;
+         uint8_t depth = vcfVelocityDynamicRange;
+         // even stranger GSt: two of the velocity response curves for
+         // filter cutoff are not used, instead another special curve
+         // is chosen. This curve is not used anywhere else.
+         if ((curveType == curve_type_nonlinear && depth == 0) ||
+             (curveType == curve_type_special   && depth == 4)) {
+             curveType = curve_type_special;
+             depth = 5;
+         }
+         return GetVelocityTable(curveType, depth,
+                                 (vcfCutoffController <= vcf_cutoff_ctrl_none2)
+                                     ? vcfVelocityScale : 0);
      }
      // get the corresponding velocity table from the table map or create & calculate that table if it doesn't exist yet
      double* DimensionRegion::GetVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling)
      {
+         // sanity check input parameters
+         // (fallback to some default parameters on ill input)
+         switch (curveType) {
+             case curve_type_nonlinear:
+             case curve_type_linear:
+                 if (depth > 4) {
+                     printf("Warning: Invalid depth (0x%x) for velocity curve type (0x%x).\n", depth, curveType);
+                     depth   = 0;
+                     scaling = 0;
+                 }
+                 break;
+             case curve_type_special:
+                 if (depth > 5) {
+                     printf("Warning: Invalid depth (0x%x) for velocity curve type 'special'.\n", depth);
+                     depth   = 0;
+                     scaling = 0;
+                 }
+                 break;
+             case curve_type_unknown:
+             default:
+                 printf("Warning: Unknown velocity curve type (0x%x).\n", curveType);
+                 curveType = curve_type_linear;
+                 depth     = 0;
+                 scaling   = 0;
+                 break;
+         }
          double* table;
          uint32_t tableKey = (curveType<<16) | (depth<<8) | scaling;
          if (pVelocityTables->count(tableKey)) { // if key exists
-Line 1746 
 namespace {
+Line 2447 
 namespace {
          return table;
      }
+     Region* DimensionRegion::GetParent() const {
+         return pRegion;
+     }
+ // show error if some _lev_ctrl_* enum entry is not listed in the following function
+ // (commented out for now, because "diagnostic push" not supported prior GCC 4.6)
+ // TODO: uncomment and add a GCC version check (see also commented "#pragma GCC diagnostic pop" below)
+ //#pragma GCC diagnostic push
+ //#pragma GCC diagnostic error "-Wswitch"
      leverage_ctrl_t DimensionRegion::DecodeLeverageController(_lev_ctrl_t EncodedController) {
          leverage_ctrl_t decodedcontroller;
          switch (EncodedController) {
-Line 1857 
 namespace {
+Line 2568 
 namespace {
                  decodedcontroller.controller_number = 95;
                  break;
+             // format extension (these controllers are so far only supported by
+             // LinuxSampler & gigedit) they will *NOT* work with
+             // Gigasampler/GigaStudio !
+             case _lev_ctrl_CC3_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 3;
+                 break;
+             case _lev_ctrl_CC6_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 6;
+                 break;
+             case _lev_ctrl_CC7_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 7;
+                 break;
+             case _lev_ctrl_CC8_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 8;
+                 break;
+             case _lev_ctrl_CC9_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 9;
+                 break;
+             case _lev_ctrl_CC10_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 10;
+                 break;
+             case _lev_ctrl_CC11_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 11;
+                 break;
+             case _lev_ctrl_CC14_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 14;
+                 break;
+             case _lev_ctrl_CC15_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 15;
+                 break;
+             case _lev_ctrl_CC20_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 20;
+                 break;
+             case _lev_ctrl_CC21_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 21;
+                 break;
+             case _lev_ctrl_CC22_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 22;
+                 break;
+             case _lev_ctrl_CC23_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 23;
+                 break;
+             case _lev_ctrl_CC24_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 24;
+                 break;
+             case _lev_ctrl_CC25_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 25;
+                 break;
+             case _lev_ctrl_CC26_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 26;
+                 break;
+             case _lev_ctrl_CC27_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 27;
+                 break;
+             case _lev_ctrl_CC28_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 28;
+                 break;
+             case _lev_ctrl_CC29_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 29;
+                 break;
+             case _lev_ctrl_CC30_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 30;
+                 break;
+             case _lev_ctrl_CC31_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 31;
+                 break;
+             case _lev_ctrl_CC68_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 68;
+                 break;
+             case _lev_ctrl_CC69_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 69;
+                 break;
+             case _lev_ctrl_CC70_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 70;
+                 break;
+             case _lev_ctrl_CC71_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 71;
+                 break;
+             case _lev_ctrl_CC72_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 72;
+                 break;
+             case _lev_ctrl_CC73_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 73;
+                 break;
+             case _lev_ctrl_CC74_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 74;
+                 break;
+             case _lev_ctrl_CC75_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 75;
+                 break;
+             case _lev_ctrl_CC76_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 76;
+                 break;
+             case _lev_ctrl_CC77_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 77;
+                 break;
+             case _lev_ctrl_CC78_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 78;
+                 break;
+             case _lev_ctrl_CC79_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 79;
+                 break;
+             case _lev_ctrl_CC84_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 84;
+                 break;
+             case _lev_ctrl_CC85_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 85;
+                 break;
+             case _lev_ctrl_CC86_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 86;
+                 break;
+             case _lev_ctrl_CC87_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 87;
+                 break;
+             case _lev_ctrl_CC89_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 89;
+                 break;
+             case _lev_ctrl_CC90_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 90;
+                 break;
+             case _lev_ctrl_CC96_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 96;
+                 break;
+             case _lev_ctrl_CC97_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 97;
+                 break;
+             case _lev_ctrl_CC102_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 102;
+                 break;
+             case _lev_ctrl_CC103_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 103;
+                 break;
+             case _lev_ctrl_CC104_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 104;
+                 break;
+             case _lev_ctrl_CC105_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 105;
+                 break;
+             case _lev_ctrl_CC106_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 106;
+                 break;
+             case _lev_ctrl_CC107_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 107;
+                 break;
+             case _lev_ctrl_CC108_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 108;
+                 break;
+             case _lev_ctrl_CC109_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 109;
+                 break;
+             case _lev_ctrl_CC110_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 110;
+                 break;
+             case _lev_ctrl_CC111_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 111;
+                 break;
+             case _lev_ctrl_CC112_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 112;
+                 break;
+             case _lev_ctrl_CC113_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 113;
+                 break;
+             case _lev_ctrl_CC114_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 114;
+                 break;
+             case _lev_ctrl_CC115_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 115;
+                 break;
+             case _lev_ctrl_CC116_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 116;
+                 break;
+             case _lev_ctrl_CC117_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 117;
+                 break;
+             case _lev_ctrl_CC118_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 118;
+                 break;
+             case _lev_ctrl_CC119_EXT:
+                 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
+                 decodedcontroller.controller_number = 119;
+                 break;
              // unknown controller type
              default:
-                 throw gig::Exception("Unknown leverage controller type.");
+                 decodedcontroller.type = leverage_ctrl_t::type_none;
+                 decodedcontroller.controller_number = 0;
+                 printf("Warning: Unknown leverage controller type (0x%x).\n", EncodedController);
+                 break;
          }
          return decodedcontroller;
      }
+ // see above (diagnostic push not supported prior GCC 4.6)
+ //#pragma GCC diagnostic pop
      DimensionRegion::_lev_ctrl_t DimensionRegion::EncodeLeverageController(leverage_ctrl_t DecodedController) {
          _lev_ctrl_t encodedcontroller;
-Line 1950 
 namespace {
+Line 2907 
 namespace {
                      case 95:
                          encodedcontroller = _lev_ctrl_effect5depth;
                          break;
+                     // format extension (these controllers are so far only
+                     // supported by LinuxSampler & gigedit) they will *NOT*
+                     // work with Gigasampler/GigaStudio !
+                     case 3:
+                         encodedcontroller = _lev_ctrl_CC3_EXT;
+                         break;
+                     case 6:
+                         encodedcontroller = _lev_ctrl_CC6_EXT;
+                         break;
+                     case 7:
+                         encodedcontroller = _lev_ctrl_CC7_EXT;
+                         break;
+                     case 8:
+                         encodedcontroller = _lev_ctrl_CC8_EXT;
+                         break;
+                     case 9:
+                         encodedcontroller = _lev_ctrl_CC9_EXT;
+                         break;
+                     case 10:
+                         encodedcontroller = _lev_ctrl_CC10_EXT;
+                         break;
+                     case 11:
+                         encodedcontroller = _lev_ctrl_CC11_EXT;
+                         break;
+                     case 14:
+                         encodedcontroller = _lev_ctrl_CC14_EXT;
+                         break;
+                     case 15:
+                         encodedcontroller = _lev_ctrl_CC15_EXT;
+                         break;
+                     case 20:
+                         encodedcontroller = _lev_ctrl_CC20_EXT;
+                         break;
+                     case 21:
+                         encodedcontroller = _lev_ctrl_CC21_EXT;
+                         break;
+                     case 22:
+                         encodedcontroller = _lev_ctrl_CC22_EXT;
+                         break;
+                     case 23:
+                         encodedcontroller = _lev_ctrl_CC23_EXT;
+                         break;
+                     case 24:
+                         encodedcontroller = _lev_ctrl_CC24_EXT;
+                         break;
+                     case 25:
+                         encodedcontroller = _lev_ctrl_CC25_EXT;
+                         break;
+                     case 26:
+                         encodedcontroller = _lev_ctrl_CC26_EXT;
+                         break;
+                     case 27:
+                         encodedcontroller = _lev_ctrl_CC27_EXT;
+                         break;
+                     case 28:
+                         encodedcontroller = _lev_ctrl_CC28_EXT;
+                         break;
+                     case 29:
+                         encodedcontroller = _lev_ctrl_CC29_EXT;
+                         break;
+                     case 30:
+                         encodedcontroller = _lev_ctrl_CC30_EXT;
+                         break;
+                     case 31:
+                         encodedcontroller = _lev_ctrl_CC31_EXT;
+                         break;
+                     case 68:
+                         encodedcontroller = _lev_ctrl_CC68_EXT;
+                         break;
+                     case 69:
+                         encodedcontroller = _lev_ctrl_CC69_EXT;
+                         break;
+                     case 70:
+                         encodedcontroller = _lev_ctrl_CC70_EXT;
+                         break;
+                     case 71:
+                         encodedcontroller = _lev_ctrl_CC71_EXT;
+                         break;
+                     case 72:
+                         encodedcontroller = _lev_ctrl_CC72_EXT;
+                         break;
+                     case 73:
+                         encodedcontroller = _lev_ctrl_CC73_EXT;
+                         break;
+                     case 74:
+                         encodedcontroller = _lev_ctrl_CC74_EXT;
+                         break;
+                     case 75:
+                         encodedcontroller = _lev_ctrl_CC75_EXT;
+                         break;
+                     case 76:
+                         encodedcontroller = _lev_ctrl_CC76_EXT;
+                         break;
+                     case 77:
+                         encodedcontroller = _lev_ctrl_CC77_EXT;
+                         break;
+                     case 78:
+                         encodedcontroller = _lev_ctrl_CC78_EXT;
+                         break;
+                     case 79:
+                         encodedcontroller = _lev_ctrl_CC79_EXT;
+                         break;
+                     case 84:
+                         encodedcontroller = _lev_ctrl_CC84_EXT;
+                         break;
+                     case 85:
+                         encodedcontroller = _lev_ctrl_CC85_EXT;
+                         break;
+                     case 86:
+                         encodedcontroller = _lev_ctrl_CC86_EXT;
+                         break;
+                     case 87:
+                         encodedcontroller = _lev_ctrl_CC87_EXT;
+                         break;
+                     case 89:
+                         encodedcontroller = _lev_ctrl_CC89_EXT;
+                         break;
+                     case 90:
+                         encodedcontroller = _lev_ctrl_CC90_EXT;
+                         break;
+                     case 96:
+                         encodedcontroller = _lev_ctrl_CC96_EXT;
+                         break;
+                     case 97:
+                         encodedcontroller = _lev_ctrl_CC97_EXT;
+                         break;
+                     case 102:
+                         encodedcontroller = _lev_ctrl_CC102_EXT;
+                         break;
+                     case 103:
+                         encodedcontroller = _lev_ctrl_CC103_EXT;
+                         break;
+                     case 104:
+                         encodedcontroller = _lev_ctrl_CC104_EXT;
+                         break;
+                     case 105:
+                         encodedcontroller = _lev_ctrl_CC105_EXT;
+                         break;
+                     case 106:
+                         encodedcontroller = _lev_ctrl_CC106_EXT;
+                         break;
+                     case 107:
+                         encodedcontroller = _lev_ctrl_CC107_EXT;
+                         break;
+                     case 108:
+                         encodedcontroller = _lev_ctrl_CC108_EXT;
+                         break;
+                     case 109:
+                         encodedcontroller = _lev_ctrl_CC109_EXT;
+                         break;
+                     case 110:
+                         encodedcontroller = _lev_ctrl_CC110_EXT;
+                         break;
+                     case 111:
+                         encodedcontroller = _lev_ctrl_CC111_EXT;
+                         break;
+                     case 112:
+                         encodedcontroller = _lev_ctrl_CC112_EXT;
+                         break;
+                     case 113:
+                         encodedcontroller = _lev_ctrl_CC113_EXT;
+                         break;
+                     case 114:
+                         encodedcontroller = _lev_ctrl_CC114_EXT;
+                         break;
+                     case 115:
+                         encodedcontroller = _lev_ctrl_CC115_EXT;
+                         break;
+                     case 116:
+                         encodedcontroller = _lev_ctrl_CC116_EXT;
+                         break;
+                     case 117:
+                         encodedcontroller = _lev_ctrl_CC117_EXT;
+                         break;
+                     case 118:
+                         encodedcontroller = _lev_ctrl_CC118_EXT;
+                         break;
+                     case 119:
+                         encodedcontroller = _lev_ctrl_CC119_EXT;
+                         break;
                      default:
                          throw gig::Exception("leverage controller number is not supported by the gig format");
                  }
+                 break;
              default:
                  throw gig::Exception("Unknown leverage controller type.");
          }
-Line 1998 
 namespace {
+Line 3138 
 namespace {
          return pVelocityCutoffTable[MIDIKeyVelocity];
      }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVelocityResponseCurve(curve_type_t curve) {
+         pVelocityAttenuationTable =
+             GetVelocityTable(
+                 curve, VelocityResponseDepth, VelocityResponseCurveScaling
+             );
+         VelocityResponseCurve = curve;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVelocityResponseDepth(uint8_t depth) {
+         pVelocityAttenuationTable =
+             GetVelocityTable(
+                 VelocityResponseCurve, depth, VelocityResponseCurveScaling
+             );
+         VelocityResponseDepth = depth;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVelocityResponseCurveScaling(uint8_t scaling) {
+         pVelocityAttenuationTable =
+             GetVelocityTable(
+                 VelocityResponseCurve, VelocityResponseDepth, scaling
+             );
+         VelocityResponseCurveScaling = scaling;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetReleaseVelocityResponseCurve(curve_type_t curve) {
+         pVelocityReleaseTable = GetReleaseVelocityTable(curve, ReleaseVelocityResponseDepth);
+         ReleaseVelocityResponseCurve = curve;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetReleaseVelocityResponseDepth(uint8_t depth) {
+         pVelocityReleaseTable = GetReleaseVelocityTable(ReleaseVelocityResponseCurve, depth);
+         ReleaseVelocityResponseDepth = depth;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVCFCutoffController(vcf_cutoff_ctrl_t controller) {
+         pVelocityCutoffTable = GetCutoffVelocityTable(VCFVelocityCurve, VCFVelocityDynamicRange, VCFVelocityScale, controller);
+         VCFCutoffController = controller;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVCFVelocityCurve(curve_type_t curve) {
+         pVelocityCutoffTable = GetCutoffVelocityTable(curve, VCFVelocityDynamicRange, VCFVelocityScale, VCFCutoffController);
+         VCFVelocityCurve = curve;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVCFVelocityDynamicRange(uint8_t range) {
+         pVelocityCutoffTable = GetCutoffVelocityTable(VCFVelocityCurve, range, VCFVelocityScale, VCFCutoffController);
+         VCFVelocityDynamicRange = range;
+     }
+     /**
+      * Updates the respective member variable and the lookup table / cache
+      * that depends on this value.
+      */
+     void DimensionRegion::SetVCFVelocityScale(uint8_t scaling) {
+         pVelocityCutoffTable = GetCutoffVelocityTable(VCFVelocityCurve, VCFVelocityDynamicRange, scaling, VCFCutoffController);
+         VCFVelocityScale = scaling;
+     }
      double* DimensionRegion::CreateVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling) {
          // line-segment approximations of the 15 velocity curves
-Line 2070 
 namespace {
+Line 3300 
 namespace {
  // *
      Region::Region(Instrument* pInstrument, RIFF::List* rgnList) : DLS::Region((DLS::Instrument*) pInstrument, rgnList) {
-         pInfo->UseFixedLengthStrings = true;
          // Initialization
          Dimensions = 0;
          for (int i = 0; i < 256; i++) {
-Line 2079 
 namespace {
+Line 3307 
 namespace {
          }
          Layers = 1;
          File* file = (File*) GetParent()->GetParent();
-         int dimensionBits = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
+         int dimensionBits = (file->pVersion && file->pVersion->major > 2) ? 8 : 5;
          // Actual Loading
+         if (!file->GetAutoLoad()) return;
          LoadDimensionRegions(rgnList);
          RIFF::Chunk* _3lnk = rgnList->GetSubChunk(CHUNK_ID_3LNK);
          if (_3lnk) {
+             _3lnk->SetPos(0);
              DimensionRegions = _3lnk->ReadUint32();
              for (int i = 0; i < dimensionBits; i++) {
                  dimension_t dimension = static_cast<dimension_t>(_3lnk->ReadUint8());
                  uint8_t     bits      = _3lnk->ReadUint8();
-                 _3lnk->ReadUint8(); // probably the position of the dimension
+                 _3lnk->ReadUint8(); // bit position of the dimension (bits[0] + bits[1] + ... + bits[i-1])
-                 _3lnk->ReadUint8(); // unknown
+                 _3lnk->ReadUint8(); // (1 << bit position of next dimension) - (1 << bit position of this dimension)
                  uint8_t     zones     = _3lnk->ReadUint8(); // new for v3: number of zones doesn't have to be == pow(2,bits)
                  if (dimension == dimension_none) { // inactive dimension
                      pDimensionDefinitions[i].dimension  = dimension_none;
-Line 2105 
 namespace {
+Line 3337 
 namespace {
                      pDimensionDefinitions[i].dimension = dimension;
                      pDimensionDefinitions[i].bits      = bits;
                      pDimensionDefinitions[i].zones     = zones ? zones : 0x01 << bits; // = pow(2,bits)
-                     pDimensionDefinitions[i].split_type = (dimension == dimension_layer ||
+                     pDimensionDefinitions[i].split_type = __resolveSplitType(dimension);
-                                                            dimension == dimension_samplechannel ||
+                     pDimensionDefinitions[i].zone_size  = __resolveZoneSize(pDimensionDefinitions[i]);
-                                                            dimension == dimension_releasetrigger ||
-                                                            dimension == dimension_keyboard ||
-                                                            dimension == dimension_roundrobin ||
-                                                            dimension == dimension_random) ? split_type_bit
-                                                                                           : split_type_normal;
-                     pDimensionDefinitions[i].zone_size  =
-                         (pDimensionDefinitions[i].split_type == split_type_normal) ? 128.0 / pDimensionDefinitions[i].zones
-                                                                                    : 0;
                      Dimensions++;
                      // if this is a layer dimension, remember the amount of layers
-Line 2129 
 namespace {
+Line 3353 
 namespace {
              UpdateVelocityTable();
              // jump to start of the wave pool indices (if not already there)
-             if (file->pVersion && file->pVersion->major == 3)
+             if (file->pVersion && file->pVersion->major > 2)
                  _3lnk->SetPos(68); // version 3 has a different 3lnk structure
              else
                  _3lnk->SetPos(44);
-             // load sample references
+             // load sample references (if auto loading is enabled)
-             for (uint i = 0; i < DimensionRegions; i++) {
+             if (file->GetAutoLoad()) {
-                 uint32_t wavepoolindex = _3lnk->ReadUint32();
+                 for (uint i = 0; i < DimensionRegions; i++) {
-                 if (file->pWavePoolTable) pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
+                     uint32_t wavepoolindex = _3lnk->ReadUint32();
+                     if (file->pWavePoolTable && pDimensionRegions[i])
+                         pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
+                 }
+                 GetSample(); // load global region sample reference
+             }
+         } else {
+             DimensionRegions = 0;
+             for (int i = 0 ; i < 8 ; i++) {
+                 pDimensionDefinitions[i].dimension  = dimension_none;
+                 pDimensionDefinitions[i].bits       = 0;
+                 pDimensionDefinitions[i].zones      = 0;
              }
-             GetSample(); // load global region sample reference
          }
          // make sure there is at least one dimension region
-Line 2147 
 namespace {
+Line 3381 
 namespace {
              RIFF::List* _3prg = rgnList->GetSubList(LIST_TYPE_3PRG);
              if (!_3prg) _3prg = rgnList->AddSubList(LIST_TYPE_3PRG);
              RIFF::List* _3ewl = _3prg->AddSubList(LIST_TYPE_3EWL);
-             pDimensionRegions[0] = new DimensionRegion(_3ewl);
+             pDimensionRegions[0] = new DimensionRegion(this, _3ewl);
              DimensionRegions = 1;
          }
      }
-Line 2159 
 namespace {
+Line 3393 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws gig::Exception if samples cannot be dereferenced
       */
-     void Region::UpdateChunks() {
+     void Region::UpdateChunks(progress_t* pProgress) {
+         // in the gig format we don't care about the Region's sample reference
+         // but we still have to provide some existing one to not corrupt the
+         // file, so to avoid the latter we simply always assign the sample of
+         // the first dimension region of this region
+         pSample = pDimensionRegions[0]->pSample;
          // first update base class's chunks
-         DLS::Region::UpdateChunks();
+         DLS::Region::UpdateChunks(pProgress);
          // update dimension region's chunks
          for (int i = 0; i < DimensionRegions; i++) {
-             pDimensionRegions[i]->UpdateChunks();
+             pDimensionRegions[i]->UpdateChunks(pProgress);
          }
          File* pFile = (File*) GetParent()->GetParent();
-         const int iMaxDimensions = (pFile->pVersion && pFile->pVersion->major == 3) ? 8 : 5;
+         const bool versiongt2 = pFile->pVersion && pFile->pVersion->major > 2;
-         const int iMaxDimensionRegions = (pFile->pVersion && pFile->pVersion->major == 3) ? 256 : 32;
+         const int iMaxDimensions =  versiongt2 ? 8 : 5;
+         const int iMaxDimensionRegions = versiongt2 ? 256 : 32;
          // make sure '3lnk' chunk exists
          RIFF::Chunk* _3lnk = pCkRegion->GetSubChunk(CHUNK_ID_3LNK);
          if (!_3lnk) {
-             const int _3lnkChunkSize = (pFile->pVersion && pFile->pVersion->major == 3) ? 1092 : 172;
+             const int _3lnkChunkSize = versiongt2 ? 1092 : 172;
              _3lnk = pCkRegion->AddSubChunk(CHUNK_ID_3LNK, _3lnkChunkSize);
+             memset(_3lnk->LoadChunkData(), 0, _3lnkChunkSize);
+             // move 3prg to last position
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubList(LIST_TYPE_3PRG), (RIFF::Chunk*)NULL);
          }
          // update dimension definitions in '3lnk' chunk
          uint8_t* pData = (uint8_t*) _3lnk->LoadChunkData();
-         memcpy(&pData[0], &DimensionRegions, 4);
+         store32(&pData[0], DimensionRegions);
+         int shift = 0;
          for (int i = 0; i < iMaxDimensions; i++) {
              pData[4 + i * 8] = (uint8_t) pDimensionDefinitions[i].dimension;
              pData[5 + i * 8] = pDimensionDefinitions[i].bits;
-             // next 2 bytes unknown
+             pData[6 + i * 8] = pDimensionDefinitions[i].dimension == dimension_none ? 0 : shift;
+             pData[7 + i * 8] = (1 << (shift + pDimensionDefinitions[i].bits)) - (1 << shift);
              pData[8 + i * 8] = pDimensionDefinitions[i].zones;
-             // next 3 bytes unknown
+             // next 3 bytes unknown, always zero?
+             shift += pDimensionDefinitions[i].bits;
          }
          // update wave pool table in '3lnk' chunk
-         const int iWavePoolOffset = (pFile->pVersion && pFile->pVersion->major == 3) ? 68 : 44;
+         const int iWavePoolOffset = versiongt2 ? 68 : 44;
          for (uint i = 0; i < iMaxDimensionRegions; i++) {
              int iWaveIndex = -1;
              if (i < DimensionRegions) {
-Line 2206 
 namespace {
+Line 3456 
 namespace {
                          break;
                      }
                  }
-                 if (iWaveIndex < 0) throw gig::Exception("Could not update gig::Region, could not find DimensionRegion's sample");
              }
-             memcpy(&pData[iWavePoolOffset + i * 4], &iWaveIndex, 4);
+             store32(&pData[iWavePoolOffset + i * 4], iWaveIndex);
+         }
+         // The following chunks are just added for compatibility with the
+         // GigaStudio software, which would show a warning if these were
+         // missing. However currently these chunks don't cover any useful
+         // data. So if this gig file uses any of our own gig format
+         // extensions which would cause this gig file to be unloadable
+         // with GSt software anyway, then just skip these GSt compatibility
+         // chunks here as well.
+         if (versiongt2 && !UsesAnyGigFormatExtension()) {
+             // add 3dnm list which always seems to be empty
+             RIFF::List* _3dnm = pCkRegion->GetSubList(LIST_TYPE_3DNM);
+             if (!_3dnm) _3dnm = pCkRegion->AddSubList(LIST_TYPE_3DNM);
+             // add 3ddp chunk which always seems to have 16 bytes of 0xFF
+             RIFF::Chunk* _3ddp = pCkRegion->GetSubChunk(CHUNK_ID_3DDP);
+             if (!_3ddp) _3ddp =  pCkRegion->AddSubChunk(CHUNK_ID_3DDP, 16);
+             uint8_t* pData = (uint8_t*) _3ddp->LoadChunkData();
+             for (int i = 0; i < 16; i += 4) {
+                 store32(&pData[i], 0xFFFFFFFF);
+             }
+             // move 3dnm and 3ddp to the end of the region list
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubList(LIST_TYPE_3DNM), (RIFF::Chunk*)NULL);
+             pCkRegion->MoveSubChunk(pCkRegion->GetSubChunk(CHUNK_ID_3DDP), (RIFF::Chunk*)NULL);
+         } else {
+             // this is intended for the user switching from GSt >= 3 version
+             // back to an older format version, delete GSt3 chunks ...
+             RIFF::List* _3dnm = pCkRegion->GetSubList(LIST_TYPE_3DNM);
+             if (_3dnm) pCkRegion->DeleteSubChunk(_3dnm);
+             RIFF::Chunk* _3ddp = pCkRegion->GetSubChunk(CHUNK_ID_3DDP);
+             if (_3ddp) pCkRegion->DeleteSubChunk(_3ddp);
          }
      }
-Line 2216 
 namespace {
+Line 3498 
 namespace {
          RIFF::List* _3prg = rgn->GetSubList(LIST_TYPE_3PRG);
          if (_3prg) {
              int dimensionRegionNr = 0;
-             RIFF::List* _3ewl = _3prg->GetFirstSubList();
+             size_t i = 0;
-             while (_3ewl) {
+             for (RIFF::List* _3ewl = _3prg->GetSubListAt(i); _3ewl;
+                  _3ewl = _3prg->GetSubListAt(++i))
+             {
                  if (_3ewl->GetListType() == LIST_TYPE_3EWL) {
-                     pDimensionRegions[dimensionRegionNr] = new DimensionRegion(_3ewl);
+                     pDimensionRegions[dimensionRegionNr] = new DimensionRegion(this, _3ewl);
                      dimensionRegionNr++;
                  }
-                 _3ewl = _3prg->GetNextSubList();
              }
              if (dimensionRegionNr == 0) throw gig::Exception("No dimension region found.");
          }
      }
+     void Region::SetKeyRange(uint16_t Low, uint16_t High) {
+         // update KeyRange struct and make sure regions are in correct order
+         DLS::Region::SetKeyRange(Low, High);
+         // update Region key table for fast lookup
+         ((gig::Instrument*)GetParent())->UpdateRegionKeyTable();
+     }
      void Region::UpdateVelocityTable() {
          // get velocity dimension's index
          int veldim = -1;
-Line 2242 
 namespace {
+Line 3532 
 namespace {
          int step = 1;
          for (int i = 0 ; i < veldim ; i++) step <<= pDimensionDefinitions[i].bits;
          int skipveldim = (step << pDimensionDefinitions[veldim].bits) - step;
-         int end = step * pDimensionDefinitions[veldim].zones;
          // loop through all dimension regions for all dimensions except the velocity dimension
          int dim[8] = { 0 };
          for (int i = 0 ; i < DimensionRegions ; i++) {
+             const int end = i + step * pDimensionDefinitions[veldim].zones;
-             if (pDimensionRegions[i]->VelocityUpperLimit) {
+             // create a velocity table for all cases where the velocity zone is zero
+             if (pDimensionRegions[i]->DimensionUpperLimits[veldim] ||
+                 pDimensionRegions[i]->VelocityUpperLimit) {
                  // create the velocity table
                  uint8_t* table = pDimensionRegions[i]->VelocityTable;
                  if (!table) {
-Line 2257 
 namespace {
+Line 3549 
 namespace {
                  }
                  int tableidx = 0;
                  int velocityZone = 0;
-                 for (int k = i ; k < end ; k += step) {
+                 if (pDimensionRegions[i]->DimensionUpperLimits[veldim]) { // gig3
-                     DimensionRegion *d = pDimensionRegions[k];
+                     for (int k = i ; k < end ; k += step) {
-                     for (; tableidx <= d->VelocityUpperLimit ; tableidx++) table[tableidx] = velocityZone;
+                         DimensionRegion *d = pDimensionRegions[k];
-                     velocityZone++;
+                         for (; tableidx <= d->DimensionUpperLimits[veldim] ; tableidx++) table[tableidx] = velocityZone;
+                         velocityZone++;
+                     }
+                 } else { // gig2
+                     for (int k = i ; k < end ; k += step) {
+                         DimensionRegion *d = pDimensionRegions[k];
+                         for (; tableidx <= d->VelocityUpperLimit ; tableidx++) table[tableidx] = velocityZone;
+                         velocityZone++;
+                     }
                  }
              } else {
                  if (pDimensionRegions[i]->VelocityTable) {
-Line 2269 
 namespace {
+Line 3569 
 namespace {
                  }
              }
+             // jump to the next case where the velocity zone is zero
              int j;
              int shift = 0;
              for (j = 0 ; j < Dimensions ; j++) {
-Line 2305 
 namespace {
+Line 3606 
 namespace {
       *                        dimension bits limit is violated
       */
      void Region::AddDimension(dimension_def_t* pDimDef) {
+         // some initial sanity checks of the given dimension definition
+         if (pDimDef->zones < 2)
+             throw gig::Exception("Could not add new dimension, amount of requested zones must always be at least two");
+         if (pDimDef->bits < 1)
+             throw gig::Exception("Could not add new dimension, amount of requested requested zone bits must always be at least one");
+         if (pDimDef->dimension == dimension_samplechannel) {
+             if (pDimDef->zones != 2)
+                 throw gig::Exception("Could not add new 'sample channel' dimensions, the requested amount of zones must always be 2 for this dimension type");
+             if (pDimDef->bits != 1)
+                 throw gig::Exception("Could not add new 'sample channel' dimensions, the requested amount of zone bits must always be 1 for this dimension type");
+         }
          // check if max. amount of dimensions reached
          File* file = (File*) GetParent()->GetParent();
-         const int iMaxDimensions = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
+         const int iMaxDimensions = (file->pVersion && file->pVersion->major > 2) ? 8 : 5;
          if (Dimensions >= iMaxDimensions)
              throw gig::Exception("Could not add new dimension, max. amount of " + ToString(iMaxDimensions) + " dimensions already reached");
          // check if max. amount of dimension bits reached
-Line 2324 
 namespace {
+Line 3637 
 namespace {
              if (pDimensionDefinitions[i].dimension == pDimDef->dimension)
                  throw gig::Exception("Could not add new dimension, there is already a dimension of the same type");
+         // pos is where the new dimension should be placed, normally
+         // last in list, except for the samplechannel dimension which
+         // has to be first in list
+         int pos = pDimDef->dimension == dimension_samplechannel ? 0 : Dimensions;
+         int bitpos = 0;
+         for (int i = 0 ; i < pos ; i++)
+             bitpos += pDimensionDefinitions[i].bits;
+         // make room for the new dimension
+         for (int i = Dimensions ; i > pos ; i--) pDimensionDefinitions[i] = pDimensionDefinitions[i - 1];
+         for (int i = 0 ; i < (1 << iCurrentBits) ; i++) {
+             for (int j = Dimensions ; j > pos ; j--) {
+                 pDimensionRegions[i]->DimensionUpperLimits[j] =
+                     pDimensionRegions[i]->DimensionUpperLimits[j - 1];
+             }
+         }
          // assign definition of new dimension
-         pDimensionDefinitions[Dimensions] = *pDimDef;
+         pDimensionDefinitions[pos] = *pDimDef;
+         // auto correct certain dimension definition fields (where possible)
+         pDimensionDefinitions[pos].split_type  =
+             __resolveSplitType(pDimensionDefinitions[pos].dimension);
+         pDimensionDefinitions[pos].zone_size =
+             __resolveZoneSize(pDimensionDefinitions[pos]);
+         // create new dimension region(s) for this new dimension, and make
+         // sure that the dimension regions are placed correctly in both the
+         // RIFF list and the pDimensionRegions array
+         RIFF::Chunk* moveTo = NULL;
+         RIFF::List* _3prg = pCkRegion->GetSubList(LIST_TYPE_3PRG);
+         for (int i = (1 << iCurrentBits) - (1 << bitpos) ; i >= 0 ; i -= (1 << bitpos)) {
+             for (int k = 0 ; k < (1 << bitpos) ; k++) {
+                 pDimensionRegions[(i << pDimDef->bits) + k] = pDimensionRegions[i + k];
+             }
+             for (int j = 1 ; j < (1 << pDimDef->bits) ; j++) {
+                 for (int k = 0 ; k < (1 << bitpos) ; k++) {
+                     RIFF::List* pNewDimRgnListChunk = _3prg->AddSubList(LIST_TYPE_3EWL);
+                     if (moveTo) _3prg->MoveSubChunk(pNewDimRgnListChunk, moveTo);
+                     // create a new dimension region and copy all parameter values from
+                     // an existing dimension region
+                     pDimensionRegions[(i << pDimDef->bits) + (j << bitpos) + k] =
+                         new DimensionRegion(pNewDimRgnListChunk, *pDimensionRegions[i + k]);
-         // create new dimension region(s) for this new dimension
+                     DimensionRegions++;
-         for (int i = 1 << iCurrentBits; i < 1 << iNewBits; i++) {
+                 }
-             //TODO: maybe we should copy existing dimension regions if possible instead of simply creating new ones with default values
+             }
-             RIFF::List* pNewDimRgnListChunk = pCkRegion->AddSubList(LIST_TYPE_3EWL);
+             moveTo = pDimensionRegions[i]->pParentList;
-             pDimensionRegions[i] = new DimensionRegion(pNewDimRgnListChunk);
+         }
-             DimensionRegions++;
+         // initialize the upper limits for this dimension
+         int mask = (1 << bitpos) - 1;
+         for (int z = 0 ; z < pDimDef->zones ; z++) {
+             uint8_t upperLimit = uint8_t((z + 1) * 128.0 / pDimDef->zones - 1);
+             for (int i = 0 ; i < 1 << iCurrentBits ; i++) {
+                 pDimensionRegions[((i & ~mask) << pDimDef->bits) |
+                                   (z << bitpos) |
+                                   (i & mask)]->DimensionUpperLimits[pos] = upperLimit;
+             }
          }
          Dimensions++;
-Line 2375 
 namespace {
+Line 3738 
 namespace {
          for (int i = iDimensionNr + 1; i < Dimensions; i++)
              iUpperBits += pDimensionDefinitions[i].bits;
+         RIFF::List* _3prg = pCkRegion->GetSubList(LIST_TYPE_3PRG);
          // delete dimension regions which belong to the given dimension
          // (that is where the dimension's bit > 0)
          for (int iUpperBit = 0; iUpperBit < 1 << iUpperBits; iUpperBit++) {
-Line 2383 
 namespace {
+Line 3748 
 namespace {
                      int iToDelete = iUpperBit    << (pDimensionDefinitions[iDimensionNr].bits + iLowerBits) |
                                      iObsoleteBit << iLowerBits |
                                      iLowerBit;
+                     _3prg->DeleteSubChunk(pDimensionRegions[iToDelete]->pParentList);
                      delete pDimensionRegions[iToDelete];
                      pDimensionRegions[iToDelete] = NULL;
                      DimensionRegions--;
-Line 2403 
 namespace {
+Line 3770 
 namespace {
              }
          }
+         // remove the this dimension from the upper limits arrays
+         for (int j = 0 ; j < 256 && pDimensionRegions[j] ; j++) {
+             DimensionRegion* d = pDimensionRegions[j];
+             for (int i = iDimensionNr + 1; i < Dimensions; i++) {
+                 d->DimensionUpperLimits[i - 1] = d->DimensionUpperLimits[i];
+             }
+             d->DimensionUpperLimits[Dimensions - 1] = 127;
+         }
          // 'remove' dimension definition
          for (int i = iDimensionNr + 1; i < Dimensions; i++) {
              pDimensionDefinitions[i - 1] = pDimensionDefinitions[i];
-Line 2417 
 namespace {
+Line 3793 
 namespace {
          if (pDimDef->dimension == dimension_layer) Layers = 1;
      }
+     /** @brief Delete one split zone of a dimension (decrement zone amount).
+      *
+      * Instead of deleting an entire dimensions, this method will only delete
+      * one particular split zone given by @a zone of the Region's dimension
+      * given by @a type. So this method will simply decrement the amount of
+      * zones by one of the dimension in question. To be able to do that, the
+      * respective dimension must exist on this Region and it must have at least
+      * 3 zones. All DimensionRegion objects associated with the zone will be
+      * deleted.
+      *
+      * @param type - identifies the dimension where a zone shall be deleted
+      * @param zone - index of the dimension split zone that shall be deleted
+      * @throws gig::Exception if requested zone could not be deleted
+      */
+     void Region::DeleteDimensionZone(dimension_t type, int zone) {
+         if (!Dimensions)
+             throw gig::Exception("Could not delete dimension zone, because there is no dimension at all.");
+         dimension_def_t* oldDef = GetDimensionDefinition(type);
+         if (!oldDef)
+             throw gig::Exception("Could not delete dimension zone, no such dimension of given type");
+         if (oldDef->zones <= 2)
+             throw gig::Exception("Could not delete dimension zone, because it would end up with only one zone.");
+         if (zone < 0 || zone >= oldDef->zones)
+             throw gig::Exception("Could not delete dimension zone, requested zone index out of bounds.");
+         const int newZoneSize = oldDef->zones - 1;
+         // create a temporary Region which just acts as a temporary copy
+         // container and will be deleted at the end of this function and will
+         // also not be visible through the API during this process
+         gig::Region* tempRgn = NULL;
+         {
+             // adding these temporary chunks is probably not even necessary
+             Instrument* instr = static_cast<Instrument*>(GetParent());
+             RIFF::List* pCkInstrument = instr->pCkInstrument;
+             RIFF::List* lrgn = pCkInstrument->GetSubList(LIST_TYPE_LRGN);
+             if (!lrgn)  lrgn = pCkInstrument->AddSubList(LIST_TYPE_LRGN);
+             RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
+             tempRgn = new Region(instr, rgn);
+         }
+         // copy this region's dimensions (with already the dimension split size
+         // requested by the arguments of this method call) to the temporary
+         // region, and don't use Region::CopyAssign() here for this task, since
+         // it would also alter fast lookup helper variables here and there
+         dimension_def_t newDef = {};
+         for (int i = 0; i < Dimensions; ++i) {
+             dimension_def_t def = pDimensionDefinitions[i]; // copy, don't reference
+             // is this the dimension requested by the method arguments? ...
+             if (def.dimension == type) { // ... if yes, decrement zone amount by one
+                 def.zones = newZoneSize;
+                 if ((1 << (def.bits - 1)) == def.zones) def.bits--;
+                 newDef = def;
+             }
+             tempRgn->AddDimension(&def);
+         }
+         // silence clang sanitizer warning
+         if (newDef.dimension == dimension_none)
+             throw gig::Exception("Unexpected internal failure resolving dimension in DeleteDimensionZone() [this is a bug].");
+         // find the dimension index in the tempRegion which is the dimension
+         // type passed to this method (paranoidly expecting different order)
+         int tempReducedDimensionIndex = -1;
+         for (int d = 0; d < tempRgn->Dimensions; ++d) {
+             if (tempRgn->pDimensionDefinitions[d].dimension == type) {
+                 tempReducedDimensionIndex = d;
+                 break;
+             }
+         }
+         // copy dimension regions from this region to the temporary region
+         for (int iDst = 0; iDst < 256; ++iDst) {
+             DimensionRegion* dstDimRgn = tempRgn->pDimensionRegions[iDst];
+             if (!dstDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             bool isValidZone = true;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int dstBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iDst >> baseBits) & ((1 << dstBits) - 1);
+                 baseBits += dstBits;
+                 // there are also DimensionRegion objects of unused zones, skip them
+                 if (dimCase[tempRgn->pDimensionDefinitions[d].dimension] >= tempRgn->pDimensionDefinitions[d].zones) {
+                     isValidZone = false;
+                     break;
+                 }
+             }
+             if (!isValidZone) continue;
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             const bool isLastZone = (dimCase[type] == newZoneSize - 1);
+             if (dimCase[type] >= zone) dimCase[type]++;
+             DimensionRegion* srcDimRgn = GetDimensionRegionByBit(dimCase);
+             dstDimRgn->CopyAssign(srcDimRgn);
+             // if this is the upper most zone of the dimension passed to this
+             // method, then correct (raise) its upper limit to 127
+             if (newDef.split_type == split_type_normal && isLastZone)
+                 dstDimRgn->DimensionUpperLimits[tempReducedDimensionIndex] = 127;
+         }
+         // now tempRegion's dimensions and DimensionRegions basically reflect
+         // what we wanted to get for this actual Region here, so we now just
+         // delete and recreate the dimension in question with the new amount
+         // zones and then copy back from tempRegion. we're actually deleting and
+         // recreating all dimensions here, to avoid altering the precise order
+         // of the dimensions (which would not be an error per se, but it would
+         // cause usability issues with instrument editors)
+         {
+             std::vector<dimension_def_t> oldDefs;
+             for (int i = 0; i < Dimensions; ++i)
+                 oldDefs.push_back(pDimensionDefinitions[i]); // copy, don't reference
+             for (int i = Dimensions - 1; i >= 0; --i)
+                 DeleteDimension(&pDimensionDefinitions[i]);
+             for (int i = 0; i < oldDefs.size(); ++i) {
+                 dimension_def_t& def = oldDefs[i];
+                 AddDimension(
+                     (def.dimension == newDef.dimension) ? &newDef : &def
+                 );
+             }
+         }
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int srcBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 baseBits += srcBits;
+             }
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             DimensionRegion* dstDimRgn = GetDimensionRegionByBit(dimCase);
+             if (!dstDimRgn) continue;
+             dstDimRgn->CopyAssign(srcDimRgn);
+         }
+         // delete temporary region
+         tempRgn->DeleteChunks();
+         delete tempRgn;
+         UpdateVelocityTable();
+     }
+     /** @brief Divide split zone of a dimension in two (increment zone amount).
+      *
+      * This will increment the amount of zones for the dimension (given by
+      * @a type) by one. It will do so by dividing the zone (given by @a zone)
+      * in the middle of its zone range in two. So the two zones resulting from
+      * the zone being splitted, will be an equivalent copy regarding all their
+      * articulation informations and sample reference. The two zones will only
+      * differ in their zone's upper limit
+      * (DimensionRegion::DimensionUpperLimits).
+      *
+      * @param type - identifies the dimension where a zone shall be splitted
+      * @param zone - index of the dimension split zone that shall be splitted
+      * @throws gig::Exception if requested zone could not be splitted
+      */
+     void Region::SplitDimensionZone(dimension_t type, int zone) {
+         if (!Dimensions)
+             throw gig::Exception("Could not split dimension zone, because there is no dimension at all.");
+         dimension_def_t* oldDef = GetDimensionDefinition(type);
+         if (!oldDef)
+             throw gig::Exception("Could not split dimension zone, no such dimension of given type");
+         if (zone < 0 || zone >= oldDef->zones)
+             throw gig::Exception("Could not split dimension zone, requested zone index out of bounds.");
+         const int newZoneSize = oldDef->zones + 1;
+         // create a temporary Region which just acts as a temporary copy
+         // container and will be deleted at the end of this function and will
+         // also not be visible through the API during this process
+         gig::Region* tempRgn = NULL;
+         {
+             // adding these temporary chunks is probably not even necessary
+             Instrument* instr = static_cast<Instrument*>(GetParent());
+             RIFF::List* pCkInstrument = instr->pCkInstrument;
+             RIFF::List* lrgn = pCkInstrument->GetSubList(LIST_TYPE_LRGN);
+             if (!lrgn)  lrgn = pCkInstrument->AddSubList(LIST_TYPE_LRGN);
+             RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
+             tempRgn = new Region(instr, rgn);
+         }
+         // copy this region's dimensions (with already the dimension split size
+         // requested by the arguments of this method call) to the temporary
+         // region, and don't use Region::CopyAssign() here for this task, since
+         // it would also alter fast lookup helper variables here and there
+         dimension_def_t newDef = {};
+         for (int i = 0; i < Dimensions; ++i) {
+             dimension_def_t def = pDimensionDefinitions[i]; // copy, don't reference
+             // is this the dimension requested by the method arguments? ...
+             if (def.dimension == type) { // ... if yes, increment zone amount by one
+                 def.zones = newZoneSize;
+                 if ((1 << oldDef->bits) < newZoneSize) def.bits++;
+                 newDef = def;
+             }
+             tempRgn->AddDimension(&def);
+         }
+         // silence clang sanitizer warning
+         if (newDef.dimension == dimension_none)
+             throw gig::Exception("Unexpected internal failure resolving dimension in SplitDimensionZone() [this is a bug].");
+         // find the dimension index in the tempRegion which is the dimension
+         // type passed to this method (paranoidly expecting different order)
+         int tempIncreasedDimensionIndex = -1;
+         for (int d = 0; d < tempRgn->Dimensions; ++d) {
+             if (tempRgn->pDimensionDefinitions[d].dimension == type) {
+                 tempIncreasedDimensionIndex = d;
+                 break;
+             }
+         }
+         // copy dimension regions from this region to the temporary region
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             bool isValidZone = true;
+             for (int d = 0, baseBits = 0; d < Dimensions; ++d) {
+                 const int srcBits = pDimensionDefinitions[d].bits;
+                 dimCase[pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 // there are also DimensionRegion objects for unused zones, skip them
+                 if (dimCase[pDimensionDefinitions[d].dimension] >= pDimensionDefinitions[d].zones) {
+                     isValidZone = false;
+                     break;
+                 }
+                 baseBits += srcBits;
+             }
+             if (!isValidZone) continue;
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             if (dimCase[type] > zone) dimCase[type]++;
+             DimensionRegion* dstDimRgn = tempRgn->GetDimensionRegionByBit(dimCase);
+             dstDimRgn->CopyAssign(srcDimRgn);
+             // if this is the requested zone to be splitted, then also copy
+             // the source DimensionRegion to the newly created target zone
+             // and set the old zones upper limit lower
+             if (dimCase[type] == zone) {
+                 // lower old zones upper limit
+                 if (newDef.split_type == split_type_normal) {
+                     const int high =
+                         dstDimRgn->DimensionUpperLimits[tempIncreasedDimensionIndex];
+                     int low = 0;
+                     if (zone > 0) {
+                         std::map<dimension_t,int> lowerCase = dimCase;
+                         lowerCase[type]--;
+                         DimensionRegion* dstDimRgnLow = tempRgn->GetDimensionRegionByBit(lowerCase);
+                         low = dstDimRgnLow->DimensionUpperLimits[tempIncreasedDimensionIndex];
+                     }
+                     dstDimRgn->DimensionUpperLimits[tempIncreasedDimensionIndex] = low + (high - low) / 2;
+                 }
+                 // fill the newly created zone of the divided zone as well
+                 dimCase[type]++;
+                 dstDimRgn = tempRgn->GetDimensionRegionByBit(dimCase);
+                 dstDimRgn->CopyAssign(srcDimRgn);
+             }
+         }
+         // now tempRegion's dimensions and DimensionRegions basically reflect
+         // what we wanted to get for this actual Region here, so we now just
+         // delete and recreate the dimension in question with the new amount
+         // zones and then copy back from tempRegion. we're actually deleting and
+         // recreating all dimensions here, to avoid altering the precise order
+         // of the dimensions (which would not be an error per se, but it would
+         // cause usability issues with instrument editors)
+         {
+             std::vector<dimension_def_t> oldDefs;
+             for (int i = 0; i < Dimensions; ++i)
+                 oldDefs.push_back(pDimensionDefinitions[i]); // copy, don't reference
+             for (int i = Dimensions - 1; i >= 0; --i)
+                 DeleteDimension(&pDimensionDefinitions[i]);
+             for (int i = 0; i < oldDefs.size(); ++i) {
+                 dimension_def_t& def = oldDefs[i];
+                 AddDimension(
+                     (def.dimension == newDef.dimension) ? &newDef : &def
+                 );
+             }
+         }
+         for (int iSrc = 0; iSrc < 256; ++iSrc) {
+             DimensionRegion* srcDimRgn = tempRgn->pDimensionRegions[iSrc];
+             if (!srcDimRgn) continue;
+             std::map<dimension_t,int> dimCase;
+             for (int d = 0, baseBits = 0; d < tempRgn->Dimensions; ++d) {
+                 const int srcBits = tempRgn->pDimensionDefinitions[d].bits;
+                 dimCase[tempRgn->pDimensionDefinitions[d].dimension] =
+                     (iSrc >> baseBits) & ((1 << srcBits) - 1);
+                 baseBits += srcBits;
+             }
+             // a bit paranoid: cope with the chance that the dimensions would
+             // have different order in source and destination regions
+             DimensionRegion* dstDimRgn = GetDimensionRegionByBit(dimCase);
+             if (!dstDimRgn) continue;
+             dstDimRgn->CopyAssign(srcDimRgn);
+         }
+         // delete temporary region
+         tempRgn->DeleteChunks();
+         delete tempRgn;
+         UpdateVelocityTable();
+     }
+     /** @brief Change type of an existing dimension.
+      *
+      * Alters the dimension type of a dimension already existing on this
+      * region. If there is currently no dimension on this Region with type
+      * @a oldType, then this call with throw an Exception. Likewise there are
+      * cases where the requested dimension type cannot be performed. For example
+      * if the new dimension type shall be gig::dimension_samplechannel, and the
+      * current dimension has more than 2 zones. In such cases an Exception is
+      * thrown as well.
+      *
+      * @param oldType - identifies the existing dimension to be changed
+      * @param newType - to which dimension type it should be changed to
+      * @throws gig::Exception if requested change cannot be performed
+      */
+     void Region::SetDimensionType(dimension_t oldType, dimension_t newType) {
+         if (oldType == newType) return;
+         dimension_def_t* def = GetDimensionDefinition(oldType);
+         if (!def)
+             throw gig::Exception("No dimension with provided old dimension type exists on this region");
+         if (newType == dimension_samplechannel && def->zones != 2)
+             throw gig::Exception("Cannot change to dimension type 'sample channel', because existing dimension does not have 2 zones");
+         if (GetDimensionDefinition(newType))
+             throw gig::Exception("There is already a dimension with requested new dimension type on this region");
+         def->dimension  = newType;
+         def->split_type = __resolveSplitType(newType);
+     }
+     DimensionRegion* Region::GetDimensionRegionByBit(const std::map<dimension_t,int>& DimCase) {
+         uint8_t bits[8] = {};
+         for (std::map<dimension_t,int>::const_iterator it = DimCase.begin();
+              it != DimCase.end(); ++it)
+         {
+             for (int d = 0; d < Dimensions; ++d) {
+                 if (pDimensionDefinitions[d].dimension == it->first) {
+                     bits[d] = it->second;
+                     goto nextDimCaseSlice;
+                 }
+             }
+             assert(false); // do crash ... too harsh maybe ? ignore it instead ?
+             nextDimCaseSlice:
+             ; // noop
+         }
+         return GetDimensionRegionByBit(bits);
+     }
+     /**
+      * Searches in the current Region for a dimension of the given dimension
+      * type and returns the precise configuration of that dimension in this
+      * Region.
+      *
+      * @param type - dimension type of the sought dimension
+      * @returns dimension definition or NULL if there is no dimension with
+      *          sought type in this Region.
+      */
+     dimension_def_t* Region::GetDimensionDefinition(dimension_t type) {
+         for (int i = 0; i < Dimensions; ++i)
+             if (pDimensionDefinitions[i].dimension == type)
+                 return &pDimensionDefinitions[i];
+         return NULL;
+     }
      Region::~Region() {
          for (int i = 0; i < 256; i++) {
              if (pDimensionRegions[i]) delete pDimensionRegions[i];
-Line 2444 
 namespace {
+Line 4184 
 namespace {
      DimensionRegion* Region::GetDimensionRegionByValue(const uint DimValues[8]) {
          uint8_t bits;
          int veldim = -1;
-         int velbitpos;
+         int velbitpos = 0;
          int bitpos = 0;
          int dimregidx = 0;
          for (uint i = 0; i < Dimensions; i++) {
-Line 2455 
 namespace {
+Line 4195 
 namespace {
              } else {
                  switch (pDimensionDefinitions[i].split_type) {
                      case split_type_normal:
-                         bits = uint8_t(DimValues[i] / pDimensionDefinitions[i].zone_size);
+                         if (pDimensionRegions[0]->DimensionUpperLimits[i]) {
+                             // gig3: all normal dimensions (not just the velocity dimension) have custom zone ranges
+                             for (bits = 0 ; bits < pDimensionDefinitions[i].zones ; bits++) {
+                                 if (DimValues[i] <= pDimensionRegions[bits << bitpos]->DimensionUpperLimits[i]) break;
+                             }
+                         } else {
+                             // gig2: evenly sized zones
+                             bits = uint8_t(DimValues[i] / pDimensionDefinitions[i].zone_size);
+                         }
                          break;
                      case split_type_bit: // the value is already the sought dimension bit number
                          const uint8_t limiter_mask = (0xff << pDimensionDefinitions[i].bits) ^ 0xff;
-Line 2466 
 namespace {
+Line 4214 
 namespace {
              }
              bitpos += pDimensionDefinitions[i].bits;
          }
-         DimensionRegion* dimreg = pDimensionRegions[dimregidx];
+         DimensionRegion* dimreg = pDimensionRegions[dimregidx & 255];
+         if (!dimreg) return NULL;
          if (veldim != -1) {
              // (dimreg is now the dimension region for the lowest velocity)
-             if (dimreg->VelocityUpperLimit) // custom defined zone ranges
+             if (dimreg->VelocityTable) // custom defined zone ranges
-                 bits = dimreg->VelocityTable[DimValues[veldim]];
+                 bits = dimreg->VelocityTable[DimValues[veldim] & 127];
              else // normal split type
-                 bits = uint8_t(DimValues[veldim] / pDimensionDefinitions[veldim].zone_size);
+                 bits = uint8_t((DimValues[veldim] & 127) / pDimensionDefinitions[veldim].zone_size);
-             dimregidx |= bits << velbitpos;
+             const uint8_t limiter_mask = (1 << pDimensionDefinitions[veldim].bits) - 1;
-             dimreg = pDimensionRegions[dimregidx];
+             dimregidx |= (bits & limiter_mask) << velbitpos;
+             dimreg = pDimensionRegions[dimregidx & 255];
          }
          return dimreg;
      }
+     int Region::GetDimensionRegionIndexByValue(const uint DimValues[8]) {
+         uint8_t bits;
+         int veldim = -1;
+         int velbitpos = 0;
+         int bitpos = 0;
+         int dimregidx = 0;
+         for (uint i = 0; i < Dimensions; i++) {
+             if (pDimensionDefinitions[i].dimension == dimension_velocity) {
+                 // the velocity dimension must be handled after the other dimensions
+                 veldim = i;
+                 velbitpos = bitpos;
+             } else {
+                 switch (pDimensionDefinitions[i].split_type) {
+                     case split_type_normal:
+                         if (pDimensionRegions[0]->DimensionUpperLimits[i]) {
+                             // gig3: all normal dimensions (not just the velocity dimension) have custom zone ranges
+                             for (bits = 0 ; bits < pDimensionDefinitions[i].zones ; bits++) {
+                                 if (DimValues[i] <= pDimensionRegions[bits << bitpos]->DimensionUpperLimits[i]) break;
+                             }
+                         } else {
+                             // gig2: evenly sized zones
+                             bits = uint8_t(DimValues[i] / pDimensionDefinitions[i].zone_size);
+                         }
+                         break;
+                     case split_type_bit: // the value is already the sought dimension bit number
+                         const uint8_t limiter_mask = (0xff << pDimensionDefinitions[i].bits) ^ 0xff;
+                         bits = DimValues[i] & limiter_mask; // just make sure the value doesn't use more bits than allowed
+                         break;
+                 }
+                 dimregidx |= bits << bitpos;
+             }
+             bitpos += pDimensionDefinitions[i].bits;
+         }
+         dimregidx &= 255;
+         DimensionRegion* dimreg = pDimensionRegions[dimregidx];
+         if (!dimreg) return -1;
+         if (veldim != -1) {
+             // (dimreg is now the dimension region for the lowest velocity)
+             if (dimreg->VelocityTable) // custom defined zone ranges
+                 bits = dimreg->VelocityTable[DimValues[veldim] & 127];
+             else // normal split type
+                 bits = uint8_t((DimValues[veldim] & 127) / pDimensionDefinitions[veldim].zone_size);
+             const uint8_t limiter_mask = (1 << pDimensionDefinitions[veldim].bits) - 1;
+             dimregidx |= (bits & limiter_mask) << velbitpos;
+             dimregidx &= 255;
+         }
+         return dimregidx;
+     }
      /**
       * Returns the appropriate DimensionRegion for the given dimension bit
       * numbers (zone index). You usually use <i>GetDimensionRegionByValue</i>
-Line 2518 
 namespace {
+Line 4318 
 namespace {
          if ((int32_t)WavePoolTableIndex == -1) return NULL;
          File* file = (File*) GetParent()->GetParent();
          if (!file->pWavePoolTable) return NULL;
-         unsigned long soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
+         if (WavePoolTableIndex + 1 > file->WavePoolCount) return NULL;
-         unsigned long soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
+         // for new files or files >= 2 GB use 64 bit wave pool offsets
-         Sample* sample = file->GetFirstSample(pProgress);
+         if (file->pRIFF->IsNew() || (file->pRIFF->GetCurrentFileSize() >> 31)) {
-         while (sample) {
+             // use 64 bit wave pool offsets (treating this as large file)
-             if (sample->ulWavePoolOffset == soughtoffset &&
+             uint64_t soughtoffset =
-                 sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
+                 uint64_t(file->pWavePoolTable[WavePoolTableIndex]) |
-             sample = file->GetNextSample();
+                 uint64_t(file->pWavePoolTableHi[WavePoolTableIndex]) << 32;
+             Sample* sample = file->GetFirstSample(pProgress);
+             while (sample) {
+                 if (sample->ullWavePoolOffset == soughtoffset)
+                     return static_cast<gig::Sample*>(sample);
+                 sample = file->GetNextSample();
+             }
+         } else {
+             // use extension files and 32 bit wave pool offsets
+             file_offset_t soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
+             file_offset_t soughtfileno = file->pWavePoolTableHi[WavePoolTableIndex];
+             Sample* sample = file->GetFirstSample(pProgress);
+             while (sample) {
+                 if (sample->ullWavePoolOffset == soughtoffset &&
+                     sample->FileNo == soughtfileno) return static_cast<gig::Sample*>(sample);
+                 sample = file->GetNextSample();
+             }
          }
          return NULL;
      }
+     /**
+      * Make a (semi) deep copy of the Region object given by @a orig
+      * and assign it to this object.
+      *
+      * Note that all sample pointers referenced by @a orig are simply copied as
+      * memory address. Thus the respective samples are shared, not duplicated!
+      *
+      * @param orig - original Region object to be copied from
+      */
+     void Region::CopyAssign(const Region* orig) {
+         CopyAssign(orig, NULL);
+     }
+     /**
+      * Make a (semi) deep copy of the Region object given by @a orig and
+      * assign it to this object
+      *
+      * @param mSamples - crosslink map between the foreign file's samples and
+      *                   this file's samples
+      */
+     void Region::CopyAssign(const Region* orig, const std::map<Sample*,Sample*>* mSamples) {
+         // handle base classes
+         DLS::Region::CopyAssign(orig);
+         if (mSamples && mSamples->count((gig::Sample*)orig->pSample)) {
+             pSample = mSamples->find((gig::Sample*)orig->pSample)->second;
+         }
+         // handle own member variables
+         for (int i = Dimensions - 1; i >= 0; --i) {
+             DeleteDimension(&pDimensionDefinitions[i]);
+         }
+         Layers = 0; // just to be sure
+         for (int i = 0; i < orig->Dimensions; i++) {
+             // we need to copy the dim definition here, to avoid the compiler
+             // complaining about const-ness issue
+             dimension_def_t def = orig->pDimensionDefinitions[i];
+             AddDimension(&def);
+         }
+         for (int i = 0; i < 256; i++) {
+             if (pDimensionRegions[i] && orig->pDimensionRegions[i]) {
+                 pDimensionRegions[i]->CopyAssign(
+                     orig->pDimensionRegions[i],
+                     mSamples
+                 );
+             }
+         }
+         Layers = orig->Layers;
+     }
+     /**
+      * Returns @c true in case this Region object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool Region::UsesAnyGigFormatExtension() const {
+         for (int i = 0; i < 256; i++) {
+             if (pDimensionRegions[i]) {
+                 if (pDimensionRegions[i]->UsesAnyGigFormatExtension())
+                     return true;
+             }
+         }
+         return false;
+     }
+ // *************** MidiRule ***************
+ // *
+     MidiRuleCtrlTrigger::MidiRuleCtrlTrigger(RIFF::Chunk* _3ewg) {
+         _3ewg->SetPos(36);
+         Triggers = _3ewg->ReadUint8();
+         _3ewg->SetPos(40);
+         ControllerNumber = _3ewg->ReadUint8();
+         _3ewg->SetPos(46);
+         for (int i = 0 ; i < Triggers ; i++) {
+             pTriggers[i].TriggerPoint = _3ewg->ReadUint8();
+             pTriggers[i].Descending = _3ewg->ReadUint8();
+             pTriggers[i].VelSensitivity = _3ewg->ReadUint8();
+             pTriggers[i].Key = _3ewg->ReadUint8();
+             pTriggers[i].NoteOff = _3ewg->ReadUint8();
+             pTriggers[i].Velocity = _3ewg->ReadUint8();
+             pTriggers[i].OverridePedal = _3ewg->ReadUint8();
+             _3ewg->ReadUint8();
+         }
+     }
+     MidiRuleCtrlTrigger::MidiRuleCtrlTrigger() :
+         ControllerNumber(0),
+         Triggers(0) {
+     }
+     void MidiRuleCtrlTrigger::UpdateChunks(uint8_t* pData) const {
+         pData[32] = 4;
+         pData[33] = 16;
+         pData[36] = Triggers;
+         pData[40] = ControllerNumber;
+         for (int i = 0 ; i < Triggers ; i++) {
+             pData[46 + i * 8] = pTriggers[i].TriggerPoint;
+             pData[47 + i * 8] = pTriggers[i].Descending;
+             pData[48 + i * 8] = pTriggers[i].VelSensitivity;
+             pData[49 + i * 8] = pTriggers[i].Key;
+             pData[50 + i * 8] = pTriggers[i].NoteOff;
+             pData[51 + i * 8] = pTriggers[i].Velocity;
+             pData[52 + i * 8] = pTriggers[i].OverridePedal;
+         }
+     }
+     MidiRuleLegato::MidiRuleLegato(RIFF::Chunk* _3ewg) {
+         _3ewg->SetPos(36);
+         LegatoSamples = _3ewg->ReadUint8(); // always 12
+         _3ewg->SetPos(40);
+         BypassUseController = _3ewg->ReadUint8();
+         BypassKey = _3ewg->ReadUint8();
+         BypassController = _3ewg->ReadUint8();
+         ThresholdTime = _3ewg->ReadUint16();
+         _3ewg->ReadInt16();
+         ReleaseTime = _3ewg->ReadUint16();
+         _3ewg->ReadInt16();
+         KeyRange.low = _3ewg->ReadUint8();
+         KeyRange.high = _3ewg->ReadUint8();
+         _3ewg->SetPos(64);
+         ReleaseTriggerKey = _3ewg->ReadUint8();
+         AltSustain1Key = _3ewg->ReadUint8();
+         AltSustain2Key = _3ewg->ReadUint8();
+     }
+     MidiRuleLegato::MidiRuleLegato() :
+         LegatoSamples(12),
+         BypassUseController(false),
+         BypassKey(0),
+         BypassController(1),
+         ThresholdTime(20),
+         ReleaseTime(20),
+         ReleaseTriggerKey(0),
+         AltSustain1Key(0),
+         AltSustain2Key(0)
+     {
+         KeyRange.low = KeyRange.high = 0;
+     }
+     void MidiRuleLegato::UpdateChunks(uint8_t* pData) const {
+         pData[32] = 0;
+         pData[33] = 16;
+         pData[36] = LegatoSamples;
+         pData[40] = BypassUseController;
+         pData[41] = BypassKey;
+         pData[42] = BypassController;
+         store16(&pData[43], ThresholdTime);
+         store16(&pData[47], ReleaseTime);
+         pData[51] = KeyRange.low;
+         pData[52] = KeyRange.high;
+         pData[64] = ReleaseTriggerKey;
+         pData[65] = AltSustain1Key;
+         pData[66] = AltSustain2Key;
+     }
+     MidiRuleAlternator::MidiRuleAlternator(RIFF::Chunk* _3ewg) {
+         _3ewg->SetPos(36);
+         Articulations = _3ewg->ReadUint8();
+         int flags = _3ewg->ReadUint8();
+         Polyphonic = flags & 8;
+         Chained = flags & 4;
+         Selector = (flags & 2) ? selector_controller :
+             (flags & 1) ? selector_key_switch : selector_none;
+         Patterns = _3ewg->ReadUint8();
+         _3ewg->ReadUint8(); // chosen row
+         _3ewg->ReadUint8(); // unknown
+         _3ewg->ReadUint8(); // unknown
+         _3ewg->ReadUint8(); // unknown
+         KeySwitchRange.low = _3ewg->ReadUint8();
+         KeySwitchRange.high = _3ewg->ReadUint8();
+         Controller = _3ewg->ReadUint8();
+         PlayRange.low = _3ewg->ReadUint8();
+         PlayRange.high = _3ewg->ReadUint8();
+         int n = std::min(int(Articulations), 32);
+         for (int i = 0 ; i < n ; i++) {
+             _3ewg->ReadString(pArticulations[i], 32);
+         }
+         _3ewg->SetPos(1072);
+         n = std::min(int(Patterns), 32);
+         for (int i = 0 ; i < n ; i++) {
+             _3ewg->ReadString(pPatterns[i].Name, 16);
+             pPatterns[i].Size = _3ewg->ReadUint8();
+             _3ewg->Read(&pPatterns[i][0], 1, 32);
+         }
+     }
+     MidiRuleAlternator::MidiRuleAlternator() :
+         Articulations(0),
+         Patterns(0),
+         Selector(selector_none),
+         Controller(0),
+         Polyphonic(false),
+         Chained(false)
+     {
+         PlayRange.low = PlayRange.high = 0;
+         KeySwitchRange.low = KeySwitchRange.high = 0;
+     }
+     void MidiRuleAlternator::UpdateChunks(uint8_t* pData) const {
+         pData[32] = 3;
+         pData[33] = 16;
+         pData[36] = Articulations;
+         pData[37] = (Polyphonic ? 8 : 0) | (Chained ? 4 : 0) |
+             (Selector == selector_controller ? 2 :
+              (Selector == selector_key_switch ? 1 : 0));
+         pData[38] = Patterns;
+         pData[43] = KeySwitchRange.low;
+         pData[44] = KeySwitchRange.high;
+         pData[45] = Controller;
+         pData[46] = PlayRange.low;
+         pData[47] = PlayRange.high;
+         char* str = reinterpret_cast<char*>(pData);
+         int pos = 48;
+         int n = std::min(int(Articulations), 32);
+         for (int i = 0 ; i < n ; i++, pos += 32) {
+             strncpy(&str[pos], pArticulations[i].c_str(), 32);
+         }
+         pos = 1072;
+         n = std::min(int(Patterns), 32);
+         for (int i = 0 ; i < n ; i++, pos += 49) {
+             strncpy(&str[pos], pPatterns[i].Name.c_str(), 16);
+             pData[pos + 16] = pPatterns[i].Size;
+             memcpy(&pData[pos + 16], &(pPatterns[i][0]), 32);
+         }
+     }
+ // *************** Script ***************
+ // *
+     Script::Script(ScriptGroup* group, RIFF::Chunk* ckScri) {
+         pGroup = group;
+         pChunk = ckScri;
+         if (ckScri) { // object is loaded from file ...
+             ckScri->SetPos(0);
+             // read header
+             uint32_t headerSize = ckScri->ReadUint32();
+             Compression = (Compression_t) ckScri->ReadUint32();
+             Encoding    = (Encoding_t) ckScri->ReadUint32();
+             Language    = (Language_t) ckScri->ReadUint32();
+             Bypass      = ckScri->ReadUint32() & 1;
+             crc         = ckScri->ReadUint32();
+             uint32_t nameSize = ckScri->ReadUint32();
+             Name.resize(nameSize, ' ');
+             for (int i = 0; i < nameSize; ++i)
+                 Name[i] = ckScri->ReadUint8();
+             // check if an uuid was already stored along with this script
+             if (headerSize >= 6*sizeof(int32_t) + nameSize + 16) { // yes ...
+                 for (uint i = 0; i < 16; ++i) {
+                     Uuid[i] = ckScri->ReadUint8();
+                 }
+             } else { // no uuid yet, generate one now ...
+                 GenerateUuid();
+             }
+             // to handle potential future extensions of the header
+             ckScri->SetPos(sizeof(int32_t) + headerSize);
+             // read actual script data
+             uint32_t scriptSize = uint32_t(ckScri->GetSize() - ckScri->GetPos());
+             data.resize(scriptSize);
+             for (int i = 0; i < scriptSize; ++i)
+                 data[i] = ckScri->ReadUint8();
+         } else { // this is a new script object, so just initialize it as such ...
+             Compression = COMPRESSION_NONE;
+             Encoding = ENCODING_ASCII;
+             Language = LANGUAGE_NKSP;
+             Bypass   = false;
+             crc      = 0;
+             Name     = "Unnamed Script";
+             GenerateUuid();
+         }
+     }
+     Script::~Script() {
+     }
+     /**
+      * Returns the current script (i.e. as source code) in text format.
+      */
+     String Script::GetScriptAsText() {
+         String s;
+         s.resize(data.size(), ' ');
+         memcpy(&s[0], &data[0], data.size());
+         return s;
+     }
+     /**
+      * Replaces the current script with the new script source code text given
+      * by @a text.
+      *
+      * @param text - new script source code
+      */
+     void Script::SetScriptAsText(const String& text) {
+         data.resize(text.size());
+         memcpy(&data[0], &text[0], text.size());
+     }
+     /** @brief Remove all RIFF chunks associated with this Script object.
+      *
+      * At the moment Script::DeleteChunks() does nothing. It is
+      * recommended to call this method explicitly though from deriving classes's
+      * own overridden implementation of this method to avoid potential future
+      * compatiblity issues.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void Script::DeleteChunks() {
+     }
+     /**
+      * Apply this script to the respective RIFF chunks. You have to call
+      * File::Save() to make changes persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
+      */
+     void Script::UpdateChunks(progress_t* pProgress) {
+         // recalculate CRC32 check sum
+         __resetCRC(crc);
+         __calculateCRC(&data[0], data.size(), crc);
+         __finalizeCRC(crc);
+         // make sure chunk exists and has the required size
+         const file_offset_t chunkSize =
+             (file_offset_t) 7*sizeof(int32_t) + Name.size() + 16 + data.size();
+         if (!pChunk) pChunk = pGroup->pList->AddSubChunk(CHUNK_ID_SCRI, chunkSize);
+         else pChunk->Resize(chunkSize);
+         // fill the chunk data to be written to disk
+         uint8_t* pData = (uint8_t*) pChunk->LoadChunkData();
+         int pos = 0;
+         store32(&pData[pos], uint32_t(6*sizeof(int32_t) + Name.size() + 16)); // total header size
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Compression);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Encoding);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Language);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], Bypass ? 1 : 0);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], crc);
+         pos += sizeof(int32_t);
+         store32(&pData[pos], (uint32_t) Name.size());
+         pos += sizeof(int32_t);
+         for (int i = 0; i < Name.size(); ++i, ++pos)
+             pData[pos] = Name[i];
+         for (int i = 0; i < 16; ++i, ++pos)
+             pData[pos] = Uuid[i];
+         for (int i = 0; i < data.size(); ++i, ++pos)
+             pData[pos] = data[i];
+     }
+     /**
+      * Generate a new Universally Unique Identifier (UUID) for this script.
+      */
+     void Script::GenerateUuid() {
+         DLS::dlsid_t dlsid;
+         DLS::Resource::GenerateDLSID(&dlsid);
+         Uuid[0]  = dlsid.ulData1       & 0xff;
+         Uuid[1]  = dlsid.ulData1 >>  8 & 0xff;
+         Uuid[2]  = dlsid.ulData1 >> 16 & 0xff;
+         Uuid[3]  = dlsid.ulData1 >> 24 & 0xff;
+         Uuid[4]  = dlsid.usData2       & 0xff;
+         Uuid[5]  = dlsid.usData2 >>  8 & 0xff;
+         Uuid[6]  = dlsid.usData3       & 0xff;
+         Uuid[7]  = dlsid.usData3 >>  8 & 0xff;
+         Uuid[8]  = dlsid.abData[0];
+         Uuid[9]  = dlsid.abData[1];
+         Uuid[10] = dlsid.abData[2];
+         Uuid[11] = dlsid.abData[3];
+         Uuid[12] = dlsid.abData[4];
+         Uuid[13] = dlsid.abData[5];
+         Uuid[14] = dlsid.abData[6];
+         Uuid[15] = dlsid.abData[7];
+     }
+     /**
+      * Move this script from its current ScriptGroup to another ScriptGroup
+      * given by @a pGroup.
+      *
+      * @param pGroup - script's new group
+      */
+     void Script::SetGroup(ScriptGroup* pGroup) {
+         if (this->pGroup == pGroup) return;
+         if (pChunk)
+             pChunk->GetParent()->MoveSubChunk(pChunk, pGroup->pList);
+         this->pGroup = pGroup;
+     }
+     /**
+      * Returns the script group this script currently belongs to. Each script
+      * is a member of exactly one ScriptGroup.
+      *
+      * @returns current script group
+      */
+     ScriptGroup* Script::GetGroup() const {
+         return pGroup;
+     }
+     /**
+      * Make a (semi) deep copy of the Script object given by @a orig
+      * and assign it to this object. Note: the ScriptGroup this Script
+      * object belongs to remains untouched by this call.
+      *
+      * @param orig - original Script object to be copied from
+      */
+     void Script::CopyAssign(const Script* orig) {
+         Name        = orig->Name;
+         Compression = orig->Compression;
+         Encoding    = orig->Encoding;
+         Language    = orig->Language;
+         Bypass      = orig->Bypass;
+         data        = orig->data;
+     }
+     void Script::RemoveAllScriptReferences() {
+         File* pFile = pGroup->pFile;
+         for (int i = 0; pFile->GetInstrument(i); ++i) {
+             Instrument* instr = pFile->GetInstrument(i);
+             instr->RemoveScript(this);
+         }
+     }
+ // *************** ScriptGroup ***************
+ // *
+     ScriptGroup::ScriptGroup(File* file, RIFF::List* lstRTIS) {
+         pFile = file;
+         pList = lstRTIS;
+         pScripts = NULL;
+         if (lstRTIS) {
+             RIFF::Chunk* ckName = lstRTIS->GetSubChunk(CHUNK_ID_LSNM);
+             ::LoadString(ckName, Name);
+         } else {
+             Name = "Default Group";
+         }
+     }
+     ScriptGroup::~ScriptGroup() {
+         if (pScripts) {
+             std::list<Script*>::iterator iter = pScripts->begin();
+             std::list<Script*>::iterator end  = pScripts->end();
+             while (iter != end) {
+                 delete *iter;
+                 ++iter;
+             }
+             delete pScripts;
+         }
+     }
+     /** @brief Remove all RIFF chunks associated with this ScriptGroup object.
+      *
+      * At the moment ScriptGroup::DeleteChunks() does nothing. It is
+      * recommended to call this method explicitly though from deriving classes's
+      * own overridden implementation of this method to avoid potential future
+      * compatiblity issues.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void ScriptGroup::DeleteChunks() {
+     }
+     /**
+      * Apply this script group to the respective RIFF chunks. You have to call
+      * File::Save() to make changes persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
+      */
+     void ScriptGroup::UpdateChunks(progress_t* pProgress) {
+         if (pScripts) {
+             if (!pList)
+                 pList = pFile->pRIFF->GetSubList(LIST_TYPE_3LS)->AddSubList(LIST_TYPE_RTIS);
+             // now store the name of this group as <LSNM> chunk as subchunk of the <RTIS> list chunk
+             ::SaveString(CHUNK_ID_LSNM, NULL, pList, Name, String("Unnamed Group"), true, 64);
+             for (std::list<Script*>::iterator it = pScripts->begin();
+                  it != pScripts->end(); ++it)
+             {
+                 (*it)->UpdateChunks(pProgress);
+             }
+         }
+     }
+     /** @brief Get instrument script.
+      *
+      * Returns the real-time instrument script with the given index.
+      *
+      * @param index - number of the sought script (0..n)
+      * @returns sought script or NULL if there's no such script
+      */
+     Script* ScriptGroup::GetScript(uint index) {
+         if (!pScripts) LoadScripts();
+         std::list<Script*>::iterator it = pScripts->begin();
+         for (uint i = 0; it != pScripts->end(); ++i, ++it)
+             if (i == index) return *it;
+         return NULL;
+     }
+     /** @brief Add new instrument script.
+      *
+      * Adds a new real-time instrument script to the file. The script is not
+      * actually used / executed unless it is referenced by an instrument to be
+      * used. This is similar to samples, which you can add to a file, without
+      * an instrument necessarily actually using it.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @return new empty script object
+      */
+     Script* ScriptGroup::AddScript() {
+         if (!pScripts) LoadScripts();
+         Script* pScript = new Script(this, NULL);
+         pScripts->push_back(pScript);
+         return pScript;
+     }
+     /** @brief Delete an instrument script.
+      *
+      * This will delete the given real-time instrument script. References of
+      * instruments that are using that script will be removed accordingly.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @param pScript - script to delete
+      * @throws gig::Exception if given script could not be found
+      */
+     void ScriptGroup::DeleteScript(Script* pScript) {
+         if (!pScripts) LoadScripts();
+         std::list<Script*>::iterator iter =
+             find(pScripts->begin(), pScripts->end(), pScript);
+         if (iter == pScripts->end())
+             throw gig::Exception("Could not delete script, could not find given script");
+         pScripts->erase(iter);
+         pScript->RemoveAllScriptReferences();
+         if (pScript->pChunk)
+             pScript->pChunk->GetParent()->DeleteSubChunk(pScript->pChunk);
+         delete pScript;
+     }
+     void ScriptGroup::LoadScripts() {
+         if (pScripts) return;
+         pScripts = new std::list<Script*>;
+         if (!pList) return;
+         size_t i = 0;
+         for (RIFF::Chunk* ck = pList->GetSubChunkAt(i); ck;
+              ck = pList->GetSubChunkAt(++i))
+         {
+             if (ck->GetChunkID() == CHUNK_ID_SCRI) {
+                 pScripts->push_back(new Script(this, ck));
+             }
+         }
+     }
  // *************** Instrument ***************
  // *
      Instrument::Instrument(File* pFile, RIFF::List* insList, progress_t* pProgress) : DLS::Instrument((DLS::File*)pFile, insList) {
-         pInfo->UseFixedLengthStrings = true;
+         static const DLS::Info::string_length_t fixedStringLengths[] = {
+             { CHUNK_ID_INAM, 64 },
+             { CHUNK_ID_ISFT, 12 },
+             { 0, 0 }
+         };
+         pInfo->SetFixedStringLengths(fixedStringLengths);
          // Initialization
          for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL;
+         EffectSend = 0;
+         Attenuation = 0;
+         FineTune = 0;
+         PitchbendRange = 2;
+         PianoReleaseMode = false;
+         DimensionKeyRange.low = 0;
+         DimensionKeyRange.high = 0;
+         pMidiRules = new MidiRule*[3];
+         pMidiRules[0] = NULL;
+         pScriptRefs = NULL;
          // Loading
          RIFF::List* lart = insList->GetSubList(LIST_TYPE_LART);
          if (lart) {
              RIFF::Chunk* _3ewg = lart->GetSubChunk(CHUNK_ID_3EWG);
              if (_3ewg) {
+                 _3ewg->SetPos(0);
                  EffectSend             = _3ewg->ReadUint16();
                  Attenuation            = _3ewg->ReadInt32();
                  FineTune               = _3ewg->ReadInt16();
-Line 2553 
 namespace {
+Line 4956 
 namespace {
                  PianoReleaseMode       = dimkeystart & 0x01;
                  DimensionKeyRange.low  = dimkeystart >> 1;
                  DimensionKeyRange.high = _3ewg->ReadUint8();
+                 if (_3ewg->GetSize() > 32) {
+                     // read MIDI rules
+                     int i = 0;
+                     _3ewg->SetPos(32);
+                     uint8_t id1 = _3ewg->ReadUint8();
+                     uint8_t id2 = _3ewg->ReadUint8();
+                     if (id2 == 16) {
+                         if (id1 == 4) {
+                             pMidiRules[i++] = new MidiRuleCtrlTrigger(_3ewg);
+                         } else if (id1 == 0) {
+                             pMidiRules[i++] = new MidiRuleLegato(_3ewg);
+                         } else if (id1 == 3) {
+                             pMidiRules[i++] = new MidiRuleAlternator(_3ewg);
+                         } else {
+                             pMidiRules[i++] = new MidiRuleUnknown;
+                         }
+                     }
+                     else if (id1 != 0 || id2 != 0) {
+                         pMidiRules[i++] = new MidiRuleUnknown;
+                     }
+                     //TODO: all the other types of rules
+                     pMidiRules[i] = NULL;
+                 }
              }
          }
-         if (!pRegions) pRegions = new RegionList;
+         if (pFile->GetAutoLoad()) {
-         RIFF::List* lrgn = insList->GetSubList(LIST_TYPE_LRGN);
+             if (!pRegions) pRegions = new RegionList;
-         if (lrgn) {
+             RIFF::List* lrgn = insList->GetSubList(LIST_TYPE_LRGN);
-             RIFF::List* rgn = lrgn->GetFirstSubList();
+             if (lrgn) {
-             while (rgn) {
+                 size_t i = 0;
-                 if (rgn->GetListType() == LIST_TYPE_RGN) {
+                 for (RIFF::List* rgn = lrgn->GetSubListAt(i); rgn;
-                     __notify_progress(pProgress, (float) pRegions->size() / (float) Regions);
+                      rgn = lrgn->GetSubListAt(++i))
-                     pRegions->push_back(new Region(this, rgn));
+                 {
+                     if (rgn->GetListType() == LIST_TYPE_RGN) {
+                         if (pProgress)
+                             __notify_progress(pProgress, (float) pRegions->size() / (float) Regions);
+                         pRegions->push_back(new Region(this, rgn));
+                     }
+                 }
+                 // Creating Region Key Table for fast lookup
+                 UpdateRegionKeyTable();
+             }
+         }
+         // own gig format extensions
+         RIFF::List* lst3LS = insList->GetSubList(LIST_TYPE_3LS);
+         if (lst3LS) {
+             // script slots (that is references to instrument scripts)
+             RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+             if (ckSCSL) {
+                 ckSCSL->SetPos(0);
+                 int headerSize = ckSCSL->ReadUint32();
+                 int slotCount  = ckSCSL->ReadUint32();
+                 if (slotCount) {
+                     int slotSize  = ckSCSL->ReadUint32();
+                     ckSCSL->SetPos(headerSize); // in case of future header extensions
+                     int unknownSpace = slotSize - 2*sizeof(uint32_t); // in case of future slot extensions
+                     for (int i = 0; i < slotCount; ++i) {
+                         _ScriptPooolEntry e;
+                         e.fileOffset = ckSCSL->ReadUint32();
+                         e.bypass     = ckSCSL->ReadUint32() & 1;
+                         if (unknownSpace) ckSCSL->SetPos(unknownSpace, RIFF::stream_curpos); // in case of future extensions
+                         scriptPoolFileOffsets.push_back(e);
+                     }
+                 }
+             }
+             // overridden script 'patch' variables
+             RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+             if (ckSCPV) {
+                 ckSCPV->SetPos(0);
+                 int nScripts = ckSCPV->ReadUint32();
+                 for (int iScript = 0; iScript < nScripts; ++iScript) {
+                     _UUID uuid;
+                     for (int i = 0; i < 16; ++i)
+                         uuid[i] = ckSCPV->ReadUint8();
+                     uint slot = ckSCPV->ReadUint32();
+                     ckSCPV->ReadUint32(); // unused, reserved 32 bit
+                     int nVars = ckSCPV->ReadUint32();
+                     for (int iVar = 0; iVar < nVars; ++iVar) {
+                         uint8_t type = ckSCPV->ReadUint8();
+                         ckSCPV->ReadUint8();  // unused, reserved byte
+                         int blobSize = ckSCPV->ReadUint16();
+                         RIFF::file_offset_t pos = ckSCPV->GetPos();
+                         // assuming 1st bit is set in 'type', otherwise blob not
+                         // supported for decoding
+                         if (type & 1) {
+                             String name, value;
+                             int len = ckSCPV->ReadUint16();
+                             for (int i = 0; i < len; ++i)
+                                 name += (char) ckSCPV->ReadUint8();
+                             len = ckSCPV->ReadUint16();
+                             for (int i = 0; i < len; ++i)
+                                 value += (char) ckSCPV->ReadUint8();
+                             if (!name.empty()) // 'name' should never be empty, but just to be sure
+                                 scriptVars[uuid][slot][name] = value;
+                         }
+                         // also for potential future extensions: seek forward
+                         // according to blob size
+                         ckSCPV->SetPos(pos + blobSize);
+                     }
                  }
-                 rgn = lrgn->GetNextSubList();
              }
-             // Creating Region Key Table for fast lookup
-             UpdateRegionKeyTable();
          }
-         __notify_progress(pProgress, 1.0f); // notify done
+         if (pProgress)
+             __notify_progress(pProgress, 1.0f); // notify done
      }
      void Instrument::UpdateRegionKeyTable() {
+         for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL;
          RegionList::iterator iter = pRegions->begin();
          RegionList::iterator end  = pRegions->end();
          for (; iter != end; ++iter) {
              gig::Region* pRegion = static_cast<gig::Region*>(*iter);
-             for (int iKey = pRegion->KeyRange.low; iKey <= pRegion->KeyRange.high; iKey++) {
+             const int low  = std::max(int(pRegion->KeyRange.low), 0);
+             const int high = std::min(int(pRegion->KeyRange.high), 127);
+             for (int iKey = low; iKey <= high; iKey++) {
                  RegionKeyTable[iKey] = pRegion;
              }
          }
      }
      Instrument::~Instrument() {
+         for (int i = 0 ; pMidiRules[i] ; i++) {
+             delete pMidiRules[i];
+         }
+         delete[] pMidiRules;
+         if (pScriptRefs) delete pScriptRefs;
      }
      /**
-Line 2595 
 namespace {
+Line 5100 
 namespace {
       * Usually there is absolutely no need to call this method explicitly.
       * It will be called automatically when File::Save() was called.
       *
+      * @param pProgress - callback function for progress notification
       * @throws gig::Exception if samples cannot be dereferenced
       */
-     void Instrument::UpdateChunks() {
+     void Instrument::UpdateChunks(progress_t* pProgress) {
          // first update base classes' chunks
-         DLS::Instrument::UpdateChunks();
+         DLS::Instrument::UpdateChunks(pProgress);
          // update Regions' chunks
          {
              RegionList::iterator iter = pRegions->begin();
              RegionList::iterator end  = pRegions->end();
              for (; iter != end; ++iter)
-                 (*iter)->UpdateChunks();
+                 (*iter)->UpdateChunks(pProgress);
          }
          // make sure 'lart' RIFF list chunk exists
-Line 2614 
 namespace {
+Line 5120 
 namespace {
          if (!lart)  lart = pCkInstrument->AddSubList(LIST_TYPE_LART);
          // make sure '3ewg' RIFF chunk exists
          RIFF::Chunk* _3ewg = lart->GetSubChunk(CHUNK_ID_3EWG);
-         if (!_3ewg)  _3ewg = lart->AddSubChunk(CHUNK_ID_3EWG, 12);
+         if (!_3ewg)  {
+             File* pFile = (File*) GetParent();
+             // 3ewg is bigger in gig3, as it includes the iMIDI rules
+             int size = (pFile->pVersion && pFile->pVersion->major > 2) ? 16416 : 12;
+             _3ewg = lart->AddSubChunk(CHUNK_ID_3EWG, size);
+             memset(_3ewg->LoadChunkData(), 0, size);
+         }
          // update '3ewg' RIFF chunk
          uint8_t* pData = (uint8_t*) _3ewg->LoadChunkData();
-         memcpy(&pData[0], &EffectSend, 2);
+         store16(&pData[0], EffectSend);
-         memcpy(&pData[2], &Attenuation, 4);
+         store32(&pData[2], Attenuation);
-         memcpy(&pData[6], &FineTune, 2);
+         store16(&pData[6], FineTune);
-         memcpy(&pData[8], &PitchbendRange, 2);
+         store16(&pData[8], PitchbendRange);
-         const uint8_t dimkeystart = (PianoReleaseMode) ? 0x01 : 0x00 |
+         const uint8_t dimkeystart = (PianoReleaseMode ? 0x01 : 0x00) |
                                      DimensionKeyRange.low << 1;
-         memcpy(&pData[10], &dimkeystart, 1);
+         pData[10] = dimkeystart;
-         memcpy(&pData[11], &DimensionKeyRange.high, 1);
+         pData[11] = DimensionKeyRange.high;
+         if (pMidiRules[0] == 0 && _3ewg->GetSize() >= 34) {
+             pData[32] = 0;
+             pData[33] = 0;
+         } else {
+             for (int i = 0 ; pMidiRules[i] ; i++) {
+                 pMidiRules[i]->UpdateChunks(pData);
+             }
+         }
+         // own gig format extensions
+        if (ScriptSlotCount()) {
+            // make sure we have converted the original loaded script file
+            // offsets into valid Script object pointers
+            LoadScripts();
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            if (!lst3LS) lst3LS = pCkInstrument->AddSubList(LIST_TYPE_3LS);
+            // save script slots (that is references to instrument scripts)
+            const int slotCount = (int) pScriptRefs->size();
+            const int headerSize = 3 * sizeof(uint32_t);
+            const int slotSize  = 2 * sizeof(uint32_t);
+            const int totalChunkSize = headerSize + slotCount * slotSize;
+            RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+            if (!ckSCSL) ckSCSL = lst3LS->AddSubChunk(CHUNK_ID_SCSL, totalChunkSize);
+            else ckSCSL->Resize(totalChunkSize);
+            uint8_t* pData = (uint8_t*) ckSCSL->LoadChunkData();
+            int pos = 0;
+            store32(&pData[pos], headerSize);
+            pos += sizeof(uint32_t);
+            store32(&pData[pos], slotCount);
+            pos += sizeof(uint32_t);
+            store32(&pData[pos], slotSize);
+            pos += sizeof(uint32_t);
+            for (int i = 0; i < slotCount; ++i) {
+                // arbitrary value, the actual file offset will be updated in
+                // UpdateScriptFileOffsets() after the file has been resized
+                int bogusFileOffset = 0;
+                store32(&pData[pos], bogusFileOffset);
+                pos += sizeof(uint32_t);
+                store32(&pData[pos], (*pScriptRefs)[i].bypass ? 1 : 0);
+                pos += sizeof(uint32_t);
+            }
+            // save overridden script 'patch' variables ...
+            // the actual 'scriptVars' member variable might contain variables of
+            // scripts which are currently no longer assigned to any script slot
+            // of this instrument, we need to get rid of these variables here to
+            // prevent saving those persistently, however instead of touching the
+            // member variable 'scriptVars' directly, rather strip a separate
+            // copy such that the overridden values are not lost during an
+            // instrument editor session (i.e. if script might be re-assigned)
+            _VarsByScript vars = stripScriptVars();
+            if (!vars.empty()) {
+                // determine total size required for 'SCPV' RIFF chunk, and the
+                // total amount of scripts being overridden (the latter is
+                // required because a script might be used on several script
+                // slots, hence vars.size() could then not be used here instead)
+                size_t totalChunkSize = 4;
+                size_t totalScriptsOverridden = 0;
+                for (const auto& script : vars) {
+                    for (const auto& slot : script.second) {
+                        totalScriptsOverridden++;
+                        totalChunkSize += 16 + 4 + 4 + 4;
+                        for (const auto& var : slot.second) {
+                            totalChunkSize += 4 + 2 + var.first.length() +
++ var.second.length();
+                        }
+                    }
+                }
+                // ensure 'SCPV' RIFF chunk exists (with required size)
+                RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+                if (!ckSCPV) ckSCPV = lst3LS->AddSubChunk(CHUNK_ID_SCPV, totalChunkSize);
+                else ckSCPV->Resize(totalChunkSize);
+                // store the actual data to 'SCPV' RIFF chunk
+                uint8_t* pData = (uint8_t*) ckSCPV->LoadChunkData();
+                int pos = 0;
+                store32(&pData[pos], (uint32_t) totalScriptsOverridden); // scripts count
+                pos += 4;
+                for (const auto& script : vars) {
+                    for (const auto& slot : script.second) {
+                        for (int i = 0; i < 16; ++i)
+                            pData[pos+i] = script.first[i]; // uuid
+                        pos += 16;
+                        store32(&pData[pos], (uint32_t) slot.first); // slot index
+                        pos += 4;
+                        store32(&pData[pos], (uint32_t) 0); // unused, reserved 32 bit
+                        pos += 4;
+                        store32(&pData[pos], (uint32_t) slot.second.size()); // variables count
+                        pos += 4;
+                        for (const auto& var : slot.second) {
+                            pData[pos++] = 1; // type
+                            pData[pos++] = 0; // reserved byte
+                            store16(&pData[pos], 2 + var.first.size() + 2 + var.second.size()); // blob size
+                            pos += 2;
+                            store16(&pData[pos], var.first.size()); // variable name length
+                            pos += 2;
+                            for (int i = 0; i < var.first.size(); ++i)
+                                pData[pos++] = var.first[i];
+                            store16(&pData[pos], var.second.size()); // variable value length
+                            pos += 2;
+                            for (int i = 0; i < var.second.size(); ++i)
+                                pData[pos++] = var.second[i];
+                        }
+                    }
+                }
+            } else {
+                // no script variable overridden by this instrument, so get rid
+                // of 'SCPV' RIFF chunk (if any)
+                RIFF::Chunk* ckSCPV = lst3LS->GetSubChunk(CHUNK_ID_SCPV);
+                if (ckSCPV) lst3LS->DeleteSubChunk(ckSCPV);
+            }
+        } else {
+            // no script slots, so get rid of any LS custom RIFF chunks (if any)
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            if (lst3LS) pCkInstrument->DeleteSubChunk(lst3LS);
+        }
+     }
+     void Instrument::UpdateScriptFileOffsets() {
+        // own gig format extensions
+        if (pScriptRefs && pScriptRefs->size() > 0) {
+            RIFF::List* lst3LS = pCkInstrument->GetSubList(LIST_TYPE_3LS);
+            RIFF::Chunk* ckSCSL = lst3LS->GetSubChunk(CHUNK_ID_SCSL);
+            const int slotCount = (int) pScriptRefs->size();
+            const int headerSize = 3 * sizeof(uint32_t);
+            ckSCSL->SetPos(headerSize);
+            for (int i = 0; i < slotCount; ++i) {
+                uint32_t fileOffset = uint32_t(
+                     (*pScriptRefs)[i].script->pChunk->GetFilePos() -
+                     (*pScriptRefs)[i].script->pChunk->GetPos() -
+                     CHUNK_HEADER_SIZE(ckSCSL->GetFile()->GetFileOffsetSize())
+                );
+                ckSCSL->WriteUint32(&fileOffset);
+                // jump over flags entry (containing the bypass flag)
+                ckSCSL->SetPos(sizeof(uint32_t), RIFF::stream_curpos);
+            }
+        }
      }
      /**
-Line 2635 
 namespace {
+Line 5290 
 namespace {
       *             there is no Region defined for the given \a Key
       */
      Region* Instrument::GetRegion(unsigned int Key) {
-         if (!pRegions || !pRegions->size() || Key > 127) return NULL;
+         if (!pRegions || pRegions->empty() || Key > 127) return NULL;
          return RegionKeyTable[Key];
          /*for (int i = 0; i < Regions; i++) {
-Line 2646 
 namespace {
+Line 5301 
 namespace {
      }
      /**
+      * Returns Region at supplied @a pos position within the region list of
+      * this instrument. If supplied @a pos is out of bounds then @c NULL is
+      * returned.
+      *
+      * @param pos - position of sought Region in region list
+      * @returns pointer address to requested region or @c NULL if @a pos is
+      *          out of bounds
+      */
+     Region* Instrument::GetRegionAt(size_t pos) {
+         if (!pRegions) return NULL;
+         if (pos >= pRegions->size()) return NULL;
+         return static_cast<gig::Region*>( (*pRegions)[pos] );
+     }
+     /**
       * Returns the first Region of the instrument. You have to call this
       * method once before you use GetNextRegion().
       *
       * @returns  pointer address to first region or NULL if there is none
       * @see      GetNextRegion()
+      * @deprecated  This method is not reentrant-safe, use GetRegionAt()
+      *              instead.
       */
      Region* Instrument::GetFirstRegion() {
          if (!pRegions) return NULL;
-Line 2665 
 namespace {
+Line 5337 
 namespace {
       *
       * @returns  pointer address to the next region or NULL if end reached
       * @see      GetFirstRegion()
+      * @deprecated  This method is not reentrant-safe, use GetRegionAt()
+      *              instead.
       */
      Region* Instrument::GetNextRegion() {
          if (!pRegions) return NULL;
-Line 2679 
 namespace {
+Line 5353 
 namespace {
          RIFF::List* rgn = lrgn->AddSubList(LIST_TYPE_RGN);
          Region* pNewRegion = new Region(this, rgn);
          pRegions->push_back(pNewRegion);
-         Regions = pRegions->size();
+         Regions = (uint32_t) pRegions->size();
          // update Region key table for fast lookup
          UpdateRegionKeyTable();
          // done
-Line 2693 
 namespace {
+Line 5367 
 namespace {
          UpdateRegionKeyTable();
      }
+     /**
+      * Move this instrument at the position before @arg dst.
+      *
+      * This method can be used to reorder the sequence of instruments in a
+      * .gig file. This might be helpful especially on large .gig files which
+      * contain a large number of instruments within the same .gig file. So
+      * grouping such instruments to similar ones, can help to keep track of them
+      * when working with such complex .gig files.
+      *
+      * When calling this method, this instrument will be removed from in its
+      * current position in the instruments list and moved to the requested
+      * target position provided by @param dst. You may also pass NULL as
+      * argument to this method, in that case this intrument will be moved to the
+      * very end of the .gig file's instrument list.
+      *
+      * You have to call Save() to make the order change persistent to the .gig
+      * file.
+      *
+      * Currently this method is limited to moving the instrument within the same
+      * .gig file. Trying to move it to another .gig file by calling this method
+      * will throw an exception.
+      *
+      * @param dst - destination instrument at which this instrument will be
+      *              moved to, or pass NULL for moving to end of list
+      * @throw gig::Exception if this instrument and target instrument are not
+      *                       part of the same file
+      */
+     void Instrument::MoveTo(Instrument* dst) {
+         if (dst && GetParent() != dst->GetParent())
+             throw Exception(
+                 "gig::Instrument::MoveTo() can only be used for moving within "
+                 "the same gig file."
+             );
+         File* pFile = (File*) GetParent();
+         // move this instrument within the instrument list
+         {
+             File::InstrumentList& list = *pFile->pInstruments;
+             File::InstrumentList::iterator itFrom =
+                 std::find(list.begin(), list.end(), static_cast<DLS::Instrument*>(this));
+             File::InstrumentList::iterator itTo =
+                 std::find(list.begin(), list.end(), static_cast<DLS::Instrument*>(dst));
+             list.splice(itTo, list, itFrom);
+         }
+         // move the instrument's actual list RIFF chunk appropriately
+         RIFF::List* lstCkInstruments = pFile->pRIFF->GetSubList(LIST_TYPE_LINS);
+         lstCkInstruments->MoveSubChunk(
+             this->pCkInstrument,
+             (RIFF::Chunk*) ((dst) ? dst->pCkInstrument : NULL)
+         );
+     }
+     /**
+      * Returns a MIDI rule of the instrument.
+      *
+      * The list of MIDI rules, at least in gig v3, always contains at
+      * most two rules. The second rule can only be the DEF filter
+      * (which currently isn't supported by libgig).
+      *
+      * @param i - MIDI rule number
+      * @returns   pointer address to MIDI rule number i or NULL if there is none
+      */
+     MidiRule* Instrument::GetMidiRule(int i) {
+         return pMidiRules[i];
+     }
+     /**
+      * Adds the "controller trigger" MIDI rule to the instrument.
+      *
+      * @returns the new MIDI rule
+      */
+     MidiRuleCtrlTrigger* Instrument::AddMidiRuleCtrlTrigger() {
+         delete pMidiRules[0];
+         MidiRuleCtrlTrigger* r = new MidiRuleCtrlTrigger;
+         pMidiRules[0] = r;
+         pMidiRules[1] = 0;
+         return r;
+     }
+     /**
+      * Adds the legato MIDI rule to the instrument.
+      *
+      * @returns the new MIDI rule
+      */
+     MidiRuleLegato* Instrument::AddMidiRuleLegato() {
+         delete pMidiRules[0];
+         MidiRuleLegato* r = new MidiRuleLegato;
+         pMidiRules[0] = r;
+         pMidiRules[1] = 0;
+         return r;
+     }
+     /**
+      * Adds the alternator MIDI rule to the instrument.
+      *
+      * @returns the new MIDI rule
+      */
+     MidiRuleAlternator* Instrument::AddMidiRuleAlternator() {
+         delete pMidiRules[0];
+         MidiRuleAlternator* r = new MidiRuleAlternator;
+         pMidiRules[0] = r;
+         pMidiRules[1] = 0;
+         return r;
+     }
+     /**
+      * Deletes a MIDI rule from the instrument.
+      *
+      * @param i - MIDI rule number
+      */
+     void Instrument::DeleteMidiRule(int i) {
+         delete pMidiRules[i];
+         pMidiRules[i] = 0;
+     }
+     void Instrument::LoadScripts() {
+         if (pScriptRefs) return;
+         pScriptRefs = new std::vector<_ScriptPooolRef>;
+         if (scriptPoolFileOffsets.empty()) return;
+         File* pFile = (File*) GetParent();
+         for (uint k = 0; k < scriptPoolFileOffsets.size(); ++k) {
+             uint32_t soughtOffset = scriptPoolFileOffsets[k].fileOffset;
+             for (uint i = 0; pFile->GetScriptGroup(i); ++i) {
+                 ScriptGroup* group = pFile->GetScriptGroup(i);
+                 for (uint s = 0; group->GetScript(s); ++s) {
+                     Script* script = group->GetScript(s);
+                     if (script->pChunk) {
+                         uint32_t offset = uint32_t(
+                             script->pChunk->GetFilePos() -
+                             script->pChunk->GetPos() -
+                             CHUNK_HEADER_SIZE(script->pChunk->GetFile()->GetFileOffsetSize())
+                         );
+                         if (offset == soughtOffset)
+                         {
+                             _ScriptPooolRef ref;
+                             ref.script = script;
+                             ref.bypass = scriptPoolFileOffsets[k].bypass;
+                             pScriptRefs->push_back(ref);
+                             break;
+                         }
+                     }
+                 }
+             }
+         }
+         // we don't need that anymore
+         scriptPoolFileOffsets.clear();
+     }
+     /** @brief Get instrument script (gig format extension).
+      *
+      * Returns the real-time instrument script of instrument script slot
+      * @a index.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - instrument script slot index
+      * @returns script or NULL if index is out of bounds
+      */
+     Script* Instrument::GetScriptOfSlot(uint index) {
+         LoadScripts();
+         if (index >= pScriptRefs->size()) return NULL;
+         return pScriptRefs->at(index).script;
+     }
+     /** @brief Add new instrument script slot (gig format extension).
+      *
+      * Add the given real-time instrument script reference to this instrument,
+      * which shall be executed by the sampler for for this instrument. The
+      * script will be added to the end of the script list of this instrument.
+      * The positions of the scripts in the Instrument's Script list are
+      * relevant, because they define in which order they shall be executed by
+      * the sampler. For this reason it is also legal to add the same script
+      * twice to an instrument, for example you might have a script called
+      * "MyFilter" which performs an event filter task, and you might have
+      * another script called "MyNoteTrigger" which triggers new notes, then you
+      * might for example have the following list of scripts on the instrument:
+      *
+      * 1. Script "MyFilter"
+      * 2. Script "MyNoteTrigger"
+      * 3. Script "MyFilter"
+      *
+      * Which would make sense, because the 2nd script launched new events, which
+      * you might need to filter as well.
+      *
+      * There are two ways to disable / "bypass" scripts. You can either disable
+      * a script locally for the respective script slot on an instrument (i.e. by
+      * passing @c false to the 2nd argument of this method, or by calling
+      * SetScriptBypassed()). Or you can disable a script globally for all slots
+      * and all instruments by setting Script::Bypass.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param pScript - script that shall be executed for this instrument
+      * @param bypass  - if enabled, the sampler shall skip executing this
+      *                  script (in the respective list position)
+      * @see SetScriptBypassed()
+      */
+     void Instrument::AddScriptSlot(Script* pScript, bool bypass) {
+         LoadScripts();
+         _ScriptPooolRef ref = { pScript, bypass };
+         pScriptRefs->push_back(ref);
+     }
+     /** @brief Flip two script slots with each other (gig format extension).
+      *
+      * Swaps the position of the two given scripts in the Instrument's Script
+      * list. The positions of the scripts in the Instrument's Script list are
+      * relevant, because they define in which order they shall be executed by
+      * the sampler.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index1 - index of the first script slot to swap
+      * @param index2 - index of the second script slot to swap
+      */
+     void Instrument::SwapScriptSlots(uint index1, uint index2) {
+         LoadScripts();
+         if (index1 >= pScriptRefs->size() || index2 >= pScriptRefs->size())
+             return;
+         _ScriptPooolRef tmp = (*pScriptRefs)[index1];
+         (*pScriptRefs)[index1] = (*pScriptRefs)[index2];
+         (*pScriptRefs)[index2] = tmp;
+     }
+     /** @brief Remove script slot.
+      *
+      * Removes the script slot with the given slot index.
+      *
+      * @param index - index of script slot to remove
+      */
+     void Instrument::RemoveScriptSlot(uint index) {
+         LoadScripts();
+         if (index >= pScriptRefs->size()) return;
+         pScriptRefs->erase( pScriptRefs->begin() + index );
+     }
+     /** @brief Remove reference to given Script (gig format extension).
+      *
+      * This will remove all script slots on the instrument which are referencing
+      * the given script.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param pScript - script reference to remove from this instrument
+      * @see RemoveScriptSlot()
+      */
+     void Instrument::RemoveScript(Script* pScript) {
+         LoadScripts();
+         for (ssize_t i = pScriptRefs->size() - 1; i >= 0; --i) {
+             if ((*pScriptRefs)[i].script == pScript) {
+                 pScriptRefs->erase( pScriptRefs->begin() + i );
+             }
+         }
+     }
+     /** @brief Instrument's amount of script slots.
+      *
+      * This method returns the amount of script slots this instrument currently
+      * uses.
+      *
+      * A script slot is a reference of a real-time instrument script to be
+      * executed by the sampler. The scripts will be executed by the sampler in
+      * sequence of the slots. One (same) script may be referenced multiple
+      * times in different slots.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      */
+     uint Instrument::ScriptSlotCount() const {
+         return uint(pScriptRefs ? pScriptRefs->size() : scriptPoolFileOffsets.size());
+     }
+     /** @brief Whether script execution shall be skipped.
+      *
+      * Defines locally for the Script reference slot in the Instrument's Script
+      * list, whether the script shall be skipped by the sampler regarding
+      * execution.
+      *
+      * It is also possible to ignore exeuction of the script globally, for all
+      * slots and for all instruments by setting Script::Bypass.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - index of the script slot on this instrument
+      * @see Script::Bypass
+      */
+     bool Instrument::IsScriptSlotBypassed(uint index) {
+         if (index >= ScriptSlotCount()) return false;
+         return pScriptRefs ? pScriptRefs->at(index).bypass
+                            : scriptPoolFileOffsets.at(index).bypass;
+     }
+     /** @brief Defines whether execution shall be skipped.
+      *
+      * You can call this method to define locally whether or whether not the
+      * given script slot shall be executed by the sampler.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * gigedit.
+      *
+      * @param index - script slot index on this instrument
+      * @param bBypass - if true, the script slot will be skipped by the sampler
+      * @see Script::Bypass
+      */
+     void Instrument::SetScriptSlotBypassed(uint index, bool bBypass) {
+         if (index >= ScriptSlotCount()) return;
+         if (pScriptRefs)
+             pScriptRefs->at(index).bypass = bBypass;
+         else
+             scriptPoolFileOffsets.at(index).bypass = bBypass;
+     }
+     /// type cast (by copy) uint8_t[16] -> std::array<uint8_t,16>
+     inline std::array<uint8_t,16> _UUIDFromCArray(const uint8_t* pData) {
+         std::array<uint8_t,16> uuid;
+         memcpy(&uuid[0], pData, 16);
+         return uuid;
+     }
+     /**
+      * Returns true if this @c Instrument has any script slot which references
+      * the @c Script identified by passed @p uuid.
+      */
+     bool Instrument::ReferencesScriptWithUuid(const _UUID& uuid) {
+         const uint nSlots = ScriptSlotCount();
+         for (uint iSlot = 0; iSlot < nSlots; ++iSlot)
+             if (_UUIDFromCArray(&GetScriptOfSlot(iSlot)->Uuid[0]) == uuid)
+                 return true;
+         return false;
+     }
+     /** @brief Checks whether a certain script 'patch' variable value is set.
+      *
+      * Returns @c true if the initial value for the requested script variable is
+      * currently overridden by this instrument.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      * @param variable - name of the 'patch' variable in that script
+      */
+     bool Instrument::IsScriptPatchVariableSet(int slot, String variable) {
+         if (variable.empty()) return false;
+         Script* script = GetScriptOfSlot(slot);
+         if (!script) return false;
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         if (!scriptVars.count(uuid)) return false;
+         const _VarsBySlot& slots = scriptVars.find(uuid)->second;
+         if (slots.empty()) return false;
+         if (slots.count(slot))
+             return slots.find(slot)->second.count(variable);
+         else
+             return slots.begin()->second.count(variable);
+     }
+     /** @brief Get all overridden script 'patch' variables.
+      *
+      * Returns map of key-value pairs reflecting all patch variables currently
+      * being overridden by this instrument for the given script @p slot, where
+      * key is the variable name and value is the hereby currently overridden
+      * value for that variable.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      */
+     std::map<String,String> Instrument::GetScriptPatchVariables(int slot) {
+         Script* script = GetScriptOfSlot(slot);
+         if (!script) return std::map<String,String>();
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         if (!scriptVars.count(uuid)) return std::map<String,String>();
+         const _VarsBySlot& slots = scriptVars.find(uuid)->second;
+         if (slots.empty()) return std::map<String,String>();
+         const _PatchVars& vars =
+             (slots.count(slot)) ?
+                 slots.find(slot)->second : slots.begin()->second;
+         return vars;
+     }
+     /** @brief Get overridden initial value for 'patch' variable.
+      *
+      * Returns current initial value for the requested script variable being
+      * overridden by this instrument.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be retrieved
+      * @param variable - name of the 'patch' variable in that script
+      */
+     String Instrument::GetScriptPatchVariable(int slot, String variable) {
+         std::map<String,String> vars = GetScriptPatchVariables(slot);
+         return (vars.count(variable)) ? vars.find(variable)->second : "";
+     }
+     /** @brief Override initial value for 'patch' variable.
+      *
+      * Overrides initial value for the requested script variable for this
+      * instrument with the passed value.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be set
+      * @param variable - name of the 'patch' variable in that script
+      * @param value - overridden initial value for that script variable
+      * @throws gig::Exception if given script @p slot index is invalid or given
+      *         @p variable name is empty
+      */
+     void Instrument::SetScriptPatchVariable(int slot, String variable, String value) {
+         if (variable.empty())
+             throw Exception("Variable name must not be empty");
+         Script* script = GetScriptOfSlot(slot);
+         if (!script)
+             throw Exception("No script slot with index " + ToString(slot));
+         const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+         scriptVars[uuid][slot][variable] = value;
+     }
+     /** @brief Drop overridden initial value(s) for 'patch' variable(s).
+      *
+      * Reverts initial value(s) for requested script variable(s) back to their
+      * default initial value(s) defined in the script itself.
+      *
+      * Both arguments of this method are optional. The most obvious use case of
+      * this method would be passing a valid script @p slot index and a
+      * (non-emtpy string as) @p variable name to this method, which would cause
+      * that single variable to be unset for that specific script slot (on this
+      * @c Instrument level).
+      *
+      * Not passing a value (or @c -1 for @p slot and/or empty string for
+      * @p variable) means 'wildcard'. So accordingly absence of argument(s) will
+      * cause all variables and/or for all script slots being unset. Hence this
+      * method serves 2^2 = 4 possible use cases in total and accordingly covers
+      * 4 different behaviours in one method.
+      *
+      * @remarks Real-time instrument scripts allow to declare special 'patch'
+      * variables, which essentially behave like regular variables of their data
+      * type, however their initial value may optionally be overridden on a per
+      * instrument basis. That allows to share scripts between instruments while
+      * still being able to fine tune certain aspects of the script for each
+      * instrument individually.
+      *
+      * @note This is an own format extension which did not exist i.e. in the
+      * GigaStudio 4 software. It will currently only work with LinuxSampler and
+      * Gigedit.
+      *
+      * @param slot - script slot index of the variable to be unset
+      * @param variable - name of the 'patch' variable in that script
+      */
+     void Instrument::UnsetScriptPatchVariable(int slot, String variable) {
+         Script* script = GetScriptOfSlot(slot);
+         // option 1: unset a particular variable of one particular script slot
+         if (slot != -1 && !variable.empty()) {
+             if (!script) return;
+             const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+             if (!scriptVars.count(uuid)) return;
+             if (!scriptVars[uuid].count(slot)) return;
+             if (scriptVars[uuid][slot].count(variable))
+                 scriptVars[uuid][slot].erase(
+                     scriptVars[uuid][slot].find(variable)
+                 );
+             if (scriptVars[uuid][slot].empty())
+                 scriptVars[uuid].erase( scriptVars[uuid].find(slot) );
+             if (scriptVars[uuid].empty())
+                 scriptVars.erase( scriptVars.find(uuid) );
+             return;
+         }
+         // option 2: unset all variables of all script slots
+         if (slot == -1 && variable.empty()) {
+             scriptVars.clear();
+             return;
+         }
+         // option 3: unset all variables of one particular script slot only
+         if (slot != -1) {
+             if (!script) return;
+             const _UUID uuid = _UUIDFromCArray(&script->Uuid[0]);
+             if (scriptVars.count(uuid))
+                 scriptVars.erase( scriptVars.find(uuid) );
+             return;
+         }
+         // option 4: unset a particular variable of all script slots
+         _VarsByScript::iterator itScript = scriptVars.begin();
+         _VarsByScript::iterator endScript = scriptVars.end();
+         while (itScript != endScript) {
+             _VarsBySlot& slots = itScript->second;
+             _VarsBySlot::iterator itSlot = slots.begin();
+             _VarsBySlot::iterator endSlot = slots.end();
+             while (itSlot != endSlot) {
+                 _PatchVars& vars = itSlot->second;
+                 if (vars.count(variable))
+                     vars.erase( vars.find(variable) );
+                 if (vars.empty())
+                     slots.erase(itSlot++); // postfix increment to avoid iterator invalidation
+                 else
+                     ++itSlot;
+             }
+             if (slots.empty())
+                 scriptVars.erase(itScript++); // postfix increment to avoid iterator invalidation
+             else
+                 ++itScript;
+         }
+     }
+     /**
+      * Returns stripped version of member variable @c scriptVars, where scripts
+      * no longer referenced by this @c Instrument are filtered out, and so are
+      * variables of meanwhile obsolete slots (i.e. a script still being
+      * referenced, but previously overridden on a script slot which either no
+      * longer exists or is hosting another script now).
+      */
+     Instrument::_VarsByScript Instrument::stripScriptVars() {
+         _VarsByScript vars;
+         _VarsByScript::const_iterator itScript = scriptVars.begin();
+         _VarsByScript::const_iterator endScript = scriptVars.end();
+         for (; itScript != endScript; ++itScript) {
+             const _UUID& uuid = itScript->first;
+             if (!ReferencesScriptWithUuid(uuid))
+                 continue;
+             const _VarsBySlot& slots = itScript->second;
+             _VarsBySlot::const_iterator itSlot = slots.begin();
+             _VarsBySlot::const_iterator endSlot = slots.end();
+             for (; itSlot != endSlot; ++itSlot) {
+                 Script* script = GetScriptOfSlot(itSlot->first);
+                 if (!script) continue;
+                 if (_UUIDFromCArray(&script->Uuid[0]) != uuid) continue;
+                 if (itSlot->second.empty()) continue;
+                 vars[uuid][itSlot->first] = itSlot->second;
+             }
+         }
+         return vars;
+     }
+     /**
+      * Make a (semi) deep copy of the Instrument object given by @a orig
+      * and assign it to this object.
+      *
+      * Note that all sample pointers referenced by @a orig are simply copied as
+      * memory address. Thus the respective samples are shared, not duplicated!
+      *
+      * @param orig - original Instrument object to be copied from
+      */
+     void Instrument::CopyAssign(const Instrument* orig) {
+         CopyAssign(orig, NULL);
+     }
+     /**
+      * Make a (semi) deep copy of the Instrument object given by @a orig
+      * and assign it to this object.
+      *
+      * @param orig - original Instrument object to be copied from
+      * @param mSamples - crosslink map between the foreign file's samples and
+      *                   this file's samples
+      */
+     void Instrument::CopyAssign(const Instrument* orig, const std::map<Sample*,Sample*>* mSamples) {
+         // handle base class
+         // (without copying DLS region stuff)
+         DLS::Instrument::CopyAssignCore(orig);
+         // handle own member variables
+         Attenuation = orig->Attenuation;
+         EffectSend = orig->EffectSend;
+         FineTune = orig->FineTune;
+         PitchbendRange = orig->PitchbendRange;
+         PianoReleaseMode = orig->PianoReleaseMode;
+         DimensionKeyRange = orig->DimensionKeyRange;
+         scriptPoolFileOffsets = orig->scriptPoolFileOffsets;
+         // deep copy of pScriptRefs required (to avoid undefined behaviour)
+         if (pScriptRefs) delete pScriptRefs;
+         pScriptRefs = new std::vector<_ScriptPooolRef>;
+         if (orig->pScriptRefs)
+             *pScriptRefs = *orig->pScriptRefs;
+         scriptVars = orig->scriptVars;
+         // free old midi rules
+         for (int i = 0 ; pMidiRules[i] ; i++) {
+             delete pMidiRules[i];
+         }
+         //TODO: MIDI rule copying
+         pMidiRules[0] = NULL;
+         // delete all old regions
+         while (Regions) DeleteRegion(GetRegionAt(0));
+         // create new regions and copy them from original
+         {
+             RegionList::const_iterator it = orig->pRegions->begin();
+             for (int i = 0; i < orig->Regions; ++i, ++it) {
+                 Region* dstRgn = AddRegion();
+                 //NOTE: Region does semi-deep copy !
+                 dstRgn->CopyAssign(
+                     static_cast<gig::Region*>(*it),
+                     mSamples
+                 );
+             }
+         }
+         UpdateRegionKeyTable();
+     }
+     /**
+      * Returns @c true in case this Instrument object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool Instrument::UsesAnyGigFormatExtension() const {
+         if (!pRegions) return false;
+         if (!scriptVars.empty()) return true;
+         RegionList::const_iterator iter = pRegions->begin();
+         RegionList::const_iterator end  = pRegions->end();
+         for (; iter != end; ++iter) {
+             gig::Region* rgn = static_cast<gig::Region*>(*iter);
+             if (rgn->UsesAnyGigFormatExtension())
+                 return true;
+         }
+         return false;
+     }
  // *************** Group ***************
-Line 2710 
 namespace {
+Line 6064 
 namespace {
          ::LoadString(pNameChunk, Name);
      }
+     /** @brief Destructor.
+      *
+      * Currently this destructor implementation does nothing.
+      */
      Group::~Group() {
      }
+     /** @brief Remove all RIFF chunks associated with this Group object.
+      *
+      * See DLS::Storage::DeleteChunks() for details.
+      */
+     void Group::DeleteChunks() {
+         // handle own RIFF chunks
+         if (pNameChunk) {
+             pNameChunk->GetParent()->DeleteSubChunk(pNameChunk);
+             pNameChunk = NULL;
+         }
+     }
      /** @brief Update chunks with current group settings.
       *
-      * Apply current Group field values to the respective. You have to call
+      * Apply current Group field values to the respective chunks. You have
-      * File::Save() to make changes persistent.
+      * to call File::Save() to make changes persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
       */
-     void Group::UpdateChunks() {
+     void Group::UpdateChunks(progress_t* pProgress) {
          // make sure <3gri> and <3gnl> list chunks exist
          RIFF::List* _3gri = pFile->pRIFF->GetSubList(LIST_TYPE_3GRI);
-         if (!_3gri) _3gri = pFile->pRIFF->AddSubList(LIST_TYPE_3GRI);
+         if (!_3gri) {
+             _3gri = pFile->pRIFF->AddSubList(LIST_TYPE_3GRI);
+             pFile->pRIFF->MoveSubChunk(_3gri, pFile->pRIFF->GetSubChunk(CHUNK_ID_PTBL));
+         }
          RIFF::List* _3gnl = _3gri->GetSubList(LIST_TYPE_3GNL);
-         if (!_3gnl) _3gnl = pFile->pRIFF->AddSubList(LIST_TYPE_3GNL);
+         if (!_3gnl) _3gnl = _3gri->AddSubList(LIST_TYPE_3GNL);
+         if (!pNameChunk && pFile->pVersion && pFile->pVersion->major > 2) {
+             // v3 has a fixed list of 128 strings, find a free one
+             size_t i = 0;
+             for (RIFF::Chunk* ck = _3gnl->GetSubChunkAt(i); ck; ck = _3gnl->GetSubChunkAt(++i)) {
+                 if (strcmp(static_cast<char*>(ck->LoadChunkData()), "") == 0) {
+                     pNameChunk = ck;
+                     break;
+                 }
+             }
+         }
          // now store the name of this group as <3gnm> chunk as subchunk of the <3gnl> list chunk
          ::SaveString(CHUNK_ID_3GNM, pNameChunk, _3gnl, Name, String("Unnamed Group"), true, 64);
      }
-Line 2799 
 namespace {
+Line 6189 
 namespace {
  // *************** File ***************
  // *
+     /// Reflects Gigasampler file format version 2.0 (1998-06-28).
+     const DLS::version_t File::VERSION_2 = {
+, 2, 19980628 & 0xffff, 19980628 >> 16
+     };
+     /// Reflects Gigasampler file format version 3.0 (2003-03-31).
+     const DLS::version_t File::VERSION_3 = {
+, 3, 20030331 & 0xffff, 20030331 >> 16
+     };
+     /// Reflects Gigasampler file format version 4.0 (2007-10-12).
+     const DLS::version_t File::VERSION_4 = {
+, 4, 20071012 & 0xffff, 20071012 >> 16
+     };
+     static const DLS::Info::string_length_t _FileFixedStringLengths[] = {
+         { CHUNK_ID_IARL, 256 },
+         { CHUNK_ID_IART, 128 },
+         { CHUNK_ID_ICMS, 128 },
+         { CHUNK_ID_ICMT, 1024 },
+         { CHUNK_ID_ICOP, 128 },
+         { CHUNK_ID_ICRD, 128 },
+         { CHUNK_ID_IENG, 128 },
+         { CHUNK_ID_IGNR, 128 },
+         { CHUNK_ID_IKEY, 128 },
+         { CHUNK_ID_IMED, 128 },
+         { CHUNK_ID_INAM, 128 },
+         { CHUNK_ID_IPRD, 128 },
+         { CHUNK_ID_ISBJ, 128 },
+         { CHUNK_ID_ISFT, 128 },
+         { CHUNK_ID_ISRC, 128 },
+         { CHUNK_ID_ISRF, 128 },
+         { CHUNK_ID_ITCH, 128 },
+         { 0, 0 }
+     };
      File::File() : DLS::File() {
+         bAutoLoad = true;
+         *pVersion = VERSION_3;
          pGroups = NULL;
-         pInfo->UseFixedLengthStrings = true;
+         pScriptGroups = NULL;
+         pInfo->SetFixedStringLengths(_FileFixedStringLengths);
+         pInfo->ArchivalLocation = String(256, ' ');
+         // add some mandatory chunks to get the file chunks in right
+         // order (INFO chunk will be moved to first position later)
+         pRIFF->AddSubChunk(CHUNK_ID_VERS, 8);
+         pRIFF->AddSubChunk(CHUNK_ID_COLH, 4);
+         pRIFF->AddSubChunk(CHUNK_ID_DLID, 16);
+         GenerateDLSID();
      }
      File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) {
+         bAutoLoad = true;
          pGroups = NULL;
-         pInfo->UseFixedLengthStrings = true;
+         pScriptGroups = NULL;
+         pInfo->SetFixedStringLengths(_FileFixedStringLengths);
      }
      File::~File() {
-Line 2819 
 namespace {
+Line 6259 
 namespace {
              }
              delete pGroups;
          }
+         if (pScriptGroups) {
+             std::list<ScriptGroup*>::iterator iter = pScriptGroups->begin();
+             std::list<ScriptGroup*>::iterator end  = pScriptGroups->end();
+             while (iter != end) {
+                 delete *iter;
+                 ++iter;
+             }
+             delete pScriptGroups;
+         }
      }
+     /**
+      * Returns a pointer to the first <i>Sample</i> object of the file,
+      * <i>NULL</i> otherwise.
+      *
+      * @param pProgress - optional: callback function for progress notification
+      * @deprecated  This method is not reentrant-safe, use GetSample()
+      *              instead.
+      */
      Sample* File::GetFirstSample(progress_t* pProgress) {
          if (!pSamples) LoadSamples(pProgress);
          if (!pSamples) return NULL;
-Line 2828 
 namespace {
+Line 6285 
 namespace {
          return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
      }
+     /**
+      * Returns a pointer to the next <i>Sample</i> object of the file,
+      * <i>NULL</i> otherwise.
+      *
+      * @deprecated  This method is not reentrant-safe, use GetSample()
+      *              instead.
+      */
      Sample* File::GetNextSample() {
          if (!pSamples) return NULL;
          SamplesIterator++;
          return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
      }
+     /**
+      * Returns Sample object of @a index.
+      *
+      * @param index - position of sample in sample list (0..n)
+      * @param pProgress - optional: callback function for progress notification
+      * @returns sample object or NULL if index is out of bounds
+      */
+     Sample* File::GetSample(size_t index, progress_t* pProgress) {
+         if (!pSamples) LoadSamples(pProgress);
+         if (!pSamples) return NULL;
+         if (index >= pSamples->size()) return NULL;
+         return static_cast<gig::Sample*>( (*pSamples)[index] );
+     }
+     /**
+      * Returns the total amount of samples of this gig file.
+      *
+      * Note that this method might block for a long time in case it is required
+      * to load the sample info for the first time.
+      *
+      * @returns total amount of samples
+      */
+     size_t File::CountSamples() {
+         if (!pSamples) LoadSamples();
+         if (!pSamples) return 0;
+         return pSamples->size();
+     }
      /** @brief Add a new sample.
       *
-Line 2848 
 namespace {
+Line 6340 
 namespace {
         // create new Sample object and its respective 'wave' list chunk
         RIFF::List* wave = wvpl->AddSubList(LIST_TYPE_WAVE);
         Sample* pSample = new Sample(this, wave, 0 /*arbitrary value, we update offsets when we save*/);
+        // add mandatory chunks to get the chunks in right order
+        wave->AddSubChunk(CHUNK_ID_FMT, 16);
+        wave->AddSubList(LIST_TYPE_INFO);
         pSamples->push_back(pSample);
         return pSample;
      }
      /** @brief Delete a sample.
       *
-      * This will delete the given Sample object from the gig file. You have
+      * This will delete the given Sample object from the gig file. Any
-      * to call Save() to make this persistent to the file.
+      * references to this sample from Regions and DimensionRegions will be
+      * removed. You have to call Save() to make this persistent to the file.
       *
       * @param pSample - sample to delete
       * @throws gig::Exception if given sample could not be found
-Line 2864 
 namespace {
+Line 6362 
 namespace {
          if (!pSamples || !pSamples->size()) throw gig::Exception("Could not delete sample as there are no samples");
          SampleList::iterator iter = find(pSamples->begin(), pSamples->end(), (DLS::Sample*) pSample);
          if (iter == pSamples->end()) throw gig::Exception("Could not delete sample, could not find given sample");
+         if (SamplesIterator != pSamples->end() && *SamplesIterator == pSample) ++SamplesIterator; // avoid iterator invalidation
          pSamples->erase(iter);
+         pSample->DeleteChunks();
          delete pSample;
+         SampleList::iterator tmp = SamplesIterator;
+         // remove all references to the sample
+         for (Instrument* instrument = GetFirstInstrument() ; instrument ;
+              instrument = GetNextInstrument()) {
+             size_t iRgn = 0;
+             for (Region* region = instrument->GetRegionAt(iRgn); region;
+                  region = instrument->GetRegionAt(++iRgn))
+             {
+                 if (region->GetSample() == pSample) region->SetSample(NULL);
+                 for (int i = 0 ; i < region->DimensionRegions ; i++) {
+                     gig::DimensionRegion *d = region->pDimensionRegions[i];
+                     if (d->pSample == pSample) d->pSample = NULL;
+                 }
+             }
+         }
+         SamplesIterator = tmp; // restore iterator
      }
      void File::LoadSamples() {
-Line 2875 
 namespace {
+Line 6393 
 namespace {
      void File::LoadSamples(progress_t* pProgress) {
          // Groups must be loaded before samples, because samples will try
          // to resolve the group they belong to
-         LoadGroups();
+         if (!pGroups) LoadGroups();
          if (!pSamples) pSamples = new SampleList;
-         RIFF::File* file = pRIFF;
          // just for progress calculation
          int iSampleIndex  = 0;
          int iTotalSamples = WavePoolCount;
-         // check if samples should be loaded from extension files
+         // just for assembling path of optional extension files to be read
-         int lastFileNo = 0;
+         const std::string folder = parentPath(pRIFF->GetFileName());
-         for (int i = 0 ; i < WavePoolCount ; i++) {
+         const std::string baseName = pathWithoutExtension(pRIFF->GetFileName());
-             if (pWavePoolTableHi[i] > lastFileNo) lastFileNo = pWavePoolTableHi[i];
-         }
+         // the main gig file and the extension files (.gx01, ... , .gx98) may
-         String name(pRIFF->GetFileName());
+         // contain wave data (wave pool)
-         int nameLen = name.length();
+         std::vector<RIFF::File*> poolFiles;
-         char suffix[6];
+         poolFiles.push_back(pRIFF);
-         if (nameLen > 4 && name.substr(nameLen - 4) == ".gig") nameLen -= 4;
+         // get info about all extension files
+         RIFF::Chunk* ckXfil = pRIFF->GetSubChunk(CHUNK_ID_XFIL);
+         if (ckXfil) { // there are extension files (.gx01, ... , .gx98) ...
+             const uint32_t n = ckXfil->ReadInt32();
+             for (int i = 0; i < n; i++) {
+                 // read the filename and load the extension file
+                 std::string name;
+                 ckXfil->ReadString(name, 128);
+                 std::string path = concatPath(folder, name);
+                 RIFF::File* pExtFile = new RIFF::File(path);
+                 // check that the dlsids match
+                 RIFF::Chunk* ckDLSID = pExtFile->GetSubChunk(CHUNK_ID_DLID);
+                 if (ckDLSID) {
+                     ::DLS::dlsid_t idExpected;
+                     idExpected.ulData1 = ckXfil->ReadInt32();
+                     idExpected.usData2 = ckXfil->ReadInt16();
+                     idExpected.usData3 = ckXfil->ReadInt16();
+                     ckXfil->Read(idExpected.abData, 8, 1);
+                     ::DLS::dlsid_t idFound;
+                     ckDLSID->Read(&idFound.ulData1, 1, 4);
+                     ckDLSID->Read(&idFound.usData2, 1, 2);
+                     ckDLSID->Read(&idFound.usData3, 1, 2);
+                     ckDLSID->Read(idFound.abData, 8, 1);
+                     if (memcmp(&idExpected, &idFound, 16) != 0)
+                         throw gig::Exception("dlsid mismatch for extension file: %s", path.c_str());
+                 }
+                 poolFiles.push_back(pExtFile);
+                 ExtensionFiles.push_back(pExtFile);
+             }
+         }
-         for (int fileNo = 0 ; ; ) {
+         // check if a .gx99 (GigaPulse) file exists
+         RIFF::Chunk* ckDoxf = pRIFF->GetSubChunk(CHUNK_ID_DOXF);
+         if (ckDoxf) { // there is a .gx99 (GigaPulse) file ...
+             std::string path = baseName + ".gx99";
+             RIFF::File* pExtFile = new RIFF::File(path);
+             // skip unused int and filename
+             ckDoxf->SetPos(132, RIFF::stream_curpos);
+             // check that the dlsids match
+             RIFF::Chunk* ckDLSID = pExtFile->GetSubChunk(CHUNK_ID_DLID);
+             if (ckDLSID) {
+                 ::DLS::dlsid_t idExpected;
+                 idExpected.ulData1 = ckDoxf->ReadInt32();
+                 idExpected.usData2 = ckDoxf->ReadInt16();
+                 idExpected.usData3 = ckDoxf->ReadInt16();
+                 ckDoxf->Read(idExpected.abData, 8, 1);
+                 ::DLS::dlsid_t idFound;
+                 ckDLSID->Read(&idFound.ulData1, 1, 4);
+                 ckDLSID->Read(&idFound.usData2, 1, 2);
+                 ckDLSID->Read(&idFound.usData3, 1, 2);
+                 ckDLSID->Read(idFound.abData, 8, 1);
+                 if (memcmp(&idExpected, &idFound, 16) != 0)
+                     throw gig::Exception("dlsid mismatch for GigaPulse file: %s", path.c_str());
+             }
+             poolFiles.push_back(pExtFile);
+             ExtensionFiles.push_back(pExtFile);
+         }
+         // load samples from extension files (if required)
+         for (int i = 0; i < poolFiles.size(); i++) {
+             RIFF::File* file = poolFiles[i];
              RIFF::List* wvpl = file->GetSubList(LIST_TYPE_WVPL);
              if (wvpl) {
-                 unsigned long wvplFileOffset = wvpl->GetFilePos();
+                 file_offset_t wvplFileOffset = wvpl->GetFilePos() -
-                 RIFF::List* wave = wvpl->GetFirstSubList();
+                                                wvpl->GetPos(); // should be zero, but just to be sure
-                 while (wave) {
+                 size_t i = 0;
+                 for (RIFF::List* wave = wvpl->GetSubListAt(i); wave;
+                      wave = wvpl->GetSubListAt(++i))
+                 {
                      if (wave->GetListType() == LIST_TYPE_WAVE) {
                          // notify current progress
-                         const float subprogress = (float) iSampleIndex / (float) iTotalSamples;
+                         if (pProgress) {
-                         __notify_progress(pProgress, subprogress);
+                             const float subprogress = (float) iSampleIndex / (float) iTotalSamples;
+                             __notify_progress(pProgress, subprogress);
+                         }
-                         unsigned long waveFileOffset = wave->GetFilePos();
+                         file_offset_t waveFileOffset = wave->GetFilePos();
-                         pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset, fileNo));
+                         pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset, i, iSampleIndex));
                          iSampleIndex++;
                      }
-                     wave = wvpl->GetNextSubList();
                  }
+             }
-                 if (fileNo == lastFileNo) break;
-                 // open extension file (*.gx01, *.gx02, ...)
-                 fileNo++;
-                 sprintf(suffix, ".gx%02d", fileNo);
-                 name.replace(nameLen, 5, suffix);
-                 file = new RIFF::File(name);
-                 ExtensionFiles.push_back(file);
-             } else break;
          }
-         __notify_progress(pProgress, 1.0); // notify done
+         if (pProgress)
+             __notify_progress(pProgress, 1.0); // notify done
      }
      Instrument* File::GetFirstInstrument() {
-Line 2942 
 namespace {
+Line 6515 
 namespace {
      }
      /**
+      * Returns the total amount of instruments of this gig file.
+      *
+      * Note that this method might block for a long time in case it is required
+      * to load the instruments info for the first time.
+      *
+      * @returns total amount of instruments
+      */
+     size_t File::CountInstruments() {
+         if (!pInstruments) LoadInstruments();
+         if (!pInstruments) return 0;
+         return pInstruments->size();
+     }
+     /**
       * Returns the instrument with the given index.
       *
       * @param index     - number of the sought instrument (0..n)
-Line 2952 
 namespace {
+Line 6539 
 namespace {
          if (!pInstruments) {
              // TODO: hack - we simply load ALL samples here, it would have been done in the Region constructor anyway (ATM)
-             // sample loading subtask
+             if (pProgress) {
-             progress_t subprogress;
+                 // sample loading subtask
-             __divide_progress(pProgress, &subprogress, 3.0f, 0.0f); // randomly schedule 33% for this subtask
+                 progress_t subprogress;
-             __notify_progress(&subprogress, 0.0f);
+                 __divide_progress(pProgress, &subprogress, 3.0f, 0.0f); // randomly schedule 33% for this subtask
-             GetFirstSample(&subprogress); // now force all samples to be loaded
+                 __notify_progress(&subprogress, 0.0f);
-             __notify_progress(&subprogress, 1.0f);
+                 if (GetAutoLoad())
+                     GetFirstSample(&subprogress); // now force all samples to be loaded
-             // instrument loading subtask
+                 __notify_progress(&subprogress, 1.0f);
-             if (pProgress && pProgress->callback) {
-                 subprogress.__range_min = subprogress.__range_max;
+                 // instrument loading subtask
-                 subprogress.__range_max = pProgress->__range_max; // schedule remaining percentage for this subtask
+                 if (pProgress->callback) {
-             }
+                     subprogress.__range_min = subprogress.__range_max;
-             __notify_progress(&subprogress, 0.0f);
+                     subprogress.__range_max = pProgress->__range_max; // schedule remaining percentage for this subtask
-             LoadInstruments(&subprogress);
+                 }
-             __notify_progress(&subprogress, 1.0f);
+                 __notify_progress(&subprogress, 0.0f);
+                 LoadInstruments(&subprogress);
+                 __notify_progress(&subprogress, 1.0f);
+             } else {
+                 // sample loading subtask
+                 if (GetAutoLoad())
+                     GetFirstSample(); // now force all samples to be loaded
+                 // instrument loading subtask
+                 LoadInstruments();
+             }
          }
          if (!pInstruments) return NULL;
          InstrumentsIterator = pInstruments->begin();
-Line 2989 
 namespace {
+Line 6586 
 namespace {
         __ensureMandatoryChunksExist();
         RIFF::List* lstInstruments = pRIFF->GetSubList(LIST_TYPE_LINS);
         RIFF::List* lstInstr = lstInstruments->AddSubList(LIST_TYPE_INS);
+        // add mandatory chunks to get the chunks in right order
+        lstInstr->AddSubList(LIST_TYPE_INFO);
+        lstInstr->AddSubChunk(CHUNK_ID_DLID, 16);
         Instrument* pInstrument = new Instrument(this, lstInstr);
+        pInstrument->GenerateDLSID();
+        lstInstr->AddSubChunk(CHUNK_ID_INSH, 12);
+        // this string is needed for the gig to be loadable in GSt:
+        pInstrument->pInfo->Software = "Endless Wave";
         pInstruments->push_back(pInstrument);
         return pInstrument;
      }
+     /** @brief Add a duplicate of an existing instrument.
+      *
+      * Duplicates the instrument definition given by @a orig and adds it
+      * to this file. This allows in an instrument editor application to
+      * easily create variations of an instrument, which will be stored in
+      * the same .gig file, sharing i.e. the same samples.
+      *
+      * Note that all sample pointers referenced by @a orig are simply copied as
+      * memory address. Thus the respective samples are shared, not duplicated!
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @param orig - original instrument to be copied
+      * @returns duplicated copy of the given instrument
+      */
+     Instrument* File::AddDuplicateInstrument(const Instrument* orig) {
+         Instrument* instr = AddInstrument();
+         instr->CopyAssign(orig);
+         return instr;
+     }
+     /** @brief Add content of another existing file.
+      *
+      * Duplicates the samples, groups and instruments of the original file
+      * given by @a pFile and adds them to @c this File. In case @c this File is
+      * a new one that you haven't saved before, then you have to call
+      * SetFileName() before calling AddContentOf(), because this method will
+      * automatically save this file during operation, which is required for
+      * writing the sample waveform data by disk streaming.
+      *
+      * @param pFile - original file whose's content shall be copied from
+      */
+     void File::AddContentOf(File* pFile) {
+         static int iCallCount = -1;
+         iCallCount++;
+         std::map<Group*,Group*> mGroups;
+         std::map<Sample*,Sample*> mSamples;
+         // clone sample groups
+         for (int i = 0; pFile->GetGroup(i); ++i) {
+             Group* g = AddGroup();
+             g->Name =
+                 "COPY" + ToString(iCallCount) + "_" + pFile->GetGroup(i)->Name;
+             mGroups[pFile->GetGroup(i)] = g;
+         }
+         // clone samples (not waveform data here yet)
+         for (int i = 0; pFile->GetSample(i); ++i) {
+             Sample* s = AddSample();
+             s->CopyAssignMeta(pFile->GetSample(i));
+             mGroups[pFile->GetSample(i)->GetGroup()]->AddSample(s);
+             mSamples[pFile->GetSample(i)] = s;
+         }
+         // clone script groups and their scripts
+         for (int iGroup = 0; pFile->GetScriptGroup(iGroup); ++iGroup) {
+             ScriptGroup* sg = pFile->GetScriptGroup(iGroup);
+             ScriptGroup* dg = AddScriptGroup();
+             dg->Name = "COPY" + ToString(iCallCount) + "_" + sg->Name;
+             for (int iScript = 0; sg->GetScript(iScript); ++iScript) {
+                 Script* ss = sg->GetScript(iScript);
+                 Script* ds = dg->AddScript();
+                 ds->CopyAssign(ss);
+             }
+         }
+         //BUG: For some reason this method only works with this additional
+         //     Save() call in between here.
+         //
+         // Important: The correct one of the 2 Save() methods has to be called
+         // here, depending on whether the file is completely new or has been
+         // saved to disk already, otherwise it will result in data corruption.
+         if (pRIFF->IsNew())
+             Save(GetFileName());
+         else
+             Save();
+         // clone instruments
+         // (passing the crosslink table here for the cloned samples)
+         for (int i = 0; pFile->GetInstrument(i); ++i) {
+             Instrument* instr = AddInstrument();
+             instr->CopyAssign(pFile->GetInstrument(i), &mSamples);
+         }
+         // Mandatory: file needs to be saved to disk at this point, so this
+         // file has the correct size and data layout for writing the samples'
+         // waveform data to disk.
+         Save();
+         // clone samples' waveform data
+         // (using direct read & write disk streaming)
+         for (int i = 0; pFile->GetSample(i); ++i) {
+             mSamples[pFile->GetSample(i)]->CopyAssignWave(pFile->GetSample(i));
+         }
+     }
      /** @brief Delete an instrument.
       *
-Line 3000 
 namespace {
+Line 6705 
 namespace {
       * have to call Save() to make this persistent to the file.
       *
       * @param pInstrument - instrument to delete
-      * @throws gig::Excption if given instrument could not be found
+      * @throws gig::Exception if given instrument could not be found
       */
      void File::DeleteInstrument(Instrument* pInstrument) {
          if (!pInstruments) throw gig::Exception("Could not delete instrument as there are no instruments");
          InstrumentList::iterator iter = find(pInstruments->begin(), pInstruments->end(), (DLS::Instrument*) pInstrument);
          if (iter == pInstruments->end()) throw gig::Exception("Could not delete instrument, could not find given instrument");
          pInstruments->erase(iter);
+         pInstrument->DeleteChunks();
          delete pInstrument;
      }
-Line 3019 
 namespace {
+Line 6725 
 namespace {
          RIFF::List* lstInstruments = pRIFF->GetSubList(LIST_TYPE_LINS);
          if (lstInstruments) {
              int iInstrumentIndex = 0;
-             RIFF::List* lstInstr = lstInstruments->GetFirstSubList();
+             size_t i = 0;
-             while (lstInstr) {
+             for (RIFF::List* lstInstr = lstInstruments->GetSubListAt(i);
+                  lstInstr; lstInstr = lstInstruments->GetSubListAt(++i))
+             {
                  if (lstInstr->GetListType() == LIST_TYPE_INS) {
-                     // notify current progress
+                     if (pProgress) {
-                     const float localProgress = (float) iInstrumentIndex / (float) Instruments;
+                         // notify current progress
-                     __notify_progress(pProgress, localProgress);
+                         const float localProgress = (float) iInstrumentIndex / (float) Instruments;
+                         __notify_progress(pProgress, localProgress);
-                     // divide local progress into subprogress for loading current Instrument
-                     progress_t subprogress;
-                     __divide_progress(pProgress, &subprogress, Instruments, iInstrumentIndex);
-                     pInstruments->push_back(new Instrument(this, lstInstr, &subprogress));
+                         // divide local progress into subprogress for loading current Instrument
+                         progress_t subprogress;
+                         __divide_progress(pProgress, &subprogress, Instruments, iInstrumentIndex);
+                         pInstruments->push_back(new Instrument(this, lstInstr, &subprogress));
+                     } else {
+                         pInstruments->push_back(new Instrument(this, lstInstr));
+                     }
                      iInstrumentIndex++;
                  }
-                 lstInstr = lstInstruments->GetNextSubList();
              }
-             __notify_progress(pProgress, 1.0); // notify done
+             if (pProgress)
+                 __notify_progress(pProgress, 1.0); // notify done
          }
      }
+     /// Updates the 3crc chunk with the checksum of a sample. The
+     /// update is done directly to disk, as this method is called
+     /// after File::Save()
+     void File::SetSampleChecksum(Sample* pSample, uint32_t crc) {
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) return;
+         // get the index of the sample
+         int iWaveIndex = GetWaveTableIndexOf(pSample);
+         if (iWaveIndex < 0) throw gig::Exception("Could not update crc, could not find sample");
+         // write the CRC-32 checksum to disk
+         _3crc->SetPos(iWaveIndex * 8);
+         uint32_t one = 1;
+         _3crc->WriteUint32(&one); // always 1
+         _3crc->WriteUint32(&crc);
+     }
+     uint32_t File::GetSampleChecksum(Sample* pSample) {
+         // get the index of the sample
+         int iWaveIndex = GetWaveTableIndexOf(pSample);
+         if (iWaveIndex < 0) throw gig::Exception("Could not retrieve reference crc of sample, could not resolve sample's wave table index");
+         return GetSampleChecksumByIndex(iWaveIndex);
+     }
+     uint32_t File::GetSampleChecksumByIndex(int index) {
+         if (index < 0) throw gig::Exception("Could not retrieve reference crc of sample, invalid wave pool index of sample");
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) throw gig::Exception("Could not retrieve reference crc of sample, no checksums stored for this file yet");
+         uint8_t* pData = (uint8_t*) _3crc->LoadChunkData();
+         if (!pData) throw gig::Exception("Could not retrieve reference crc of sample, no checksums stored for this file yet");
+         // read the CRC-32 checksum directly from disk
+         size_t pos = index * 8;
+         if (pos + 8 > _3crc->GetNewSize())
+             throw gig::Exception("Could not retrieve reference crc of sample, could not seek to required position in crc chunk");
+         uint32_t one = load32(&pData[pos]); // always 1
+         if (one != 1)
+             throw gig::Exception("Could not retrieve reference crc of sample, because reference checksum table is damaged");
+         return load32(&pData[pos+4]);
+     }
+     int File::GetWaveTableIndexOf(gig::Sample* pSample) {
+         if (!pSamples) GetFirstSample(); // make sure sample chunks were scanned
+         File::SampleList::iterator iter = pSamples->begin();
+         File::SampleList::iterator end  = pSamples->end();
+         for (int index = 0; iter != end; ++iter, ++index)
+             if (*iter == pSample)
+                 return index;
+         return -1;
+     }
+     /**
+      * Checks whether the file's "3CRC" chunk was damaged. This chunk contains
+      * the CRC32 check sums of all samples' raw wave data.
+      *
+      * @return true if 3CRC chunk is OK, or false if 3CRC chunk is damaged
+      */
+     bool File::VerifySampleChecksumTable() {
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) return false;
+         if (_3crc->GetNewSize() <= 0) return false;
+         if (_3crc->GetNewSize() % 8) return false;
+         if (!pSamples) GetFirstSample(); // make sure sample chunks were scanned
+         if (_3crc->GetNewSize() != pSamples->size() * 8) return false;
+         const file_offset_t n = _3crc->GetNewSize() / 8;
+         uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+         if (!pData) return false;
+         for (file_offset_t i = 0; i < n; ++i) {
+             uint32_t one = pData[i*2];
+             if (one != 1) return false;
+         }
+         return true;
+     }
+     /**
+      * Recalculates CRC32 checksums for all samples and rebuilds this gig
+      * file's checksum table with those new checksums. This might usually
+      * just be necessary if the checksum table was damaged.
+      *
+      * @e IMPORTANT: The current implementation of this method only works
+      * with files that have not been modified since it was loaded, because
+      * it expects that no externally caused file structure changes are
+      * required!
+      *
+      * Due to the expectation above, this method is currently protected
+      * and actually only used by the command line tool "gigdump" yet.
+      *
+      * @returns true if Save() is required to be called after this call,
+      *          false if no further action is required
+      */
+     bool File::RebuildSampleChecksumTable() {
+         // make sure sample chunks were scanned
+         if (!pSamples) GetFirstSample();
+         bool bRequiresSave = false;
+         // make sure "3CRC" chunk exists with required size
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (!_3crc) {
+             _3crc = pRIFF->AddSubChunk(CHUNK_ID_3CRC, pSamples->size() * 8);
+             // the order of einf and 3crc is not the same in v2 and v3
+             RIFF::Chunk* einf = pRIFF->GetSubChunk(CHUNK_ID_EINF);
+             if (einf && pVersion && pVersion->major > 2) pRIFF->MoveSubChunk(_3crc, einf);
+             bRequiresSave = true;
+         } else if (_3crc->GetNewSize() != pSamples->size() * 8) {
+             _3crc->Resize(pSamples->size() * 8);
+             bRequiresSave = true;
+         }
+         if (bRequiresSave) { // refill CRC table for all samples in RAM ...
+             uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+             {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (; iter != end; ++iter) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     int index = GetWaveTableIndexOf(pSample);
+                     if (index < 0) throw gig::Exception("Could not rebuild crc table for samples, wave table index of a sample could not be resolved");
+                     pData[index*2]   = 1; // always 1
+                     pData[index*2+1] = pSample->CalculateWaveDataChecksum();
+                 }
+             }
+         } else { // no file structure changes necessary, so directly write to disk and we are done ...
+             // make sure file is in write mode
+             pRIFF->SetMode(RIFF::stream_mode_read_write);
+             {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (; iter != end; ++iter) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     int index = GetWaveTableIndexOf(pSample);
+                     if (index < 0) throw gig::Exception("Could not rebuild crc table for samples, wave table index of a sample could not be resolved");
+                     pSample->crc  = pSample->CalculateWaveDataChecksum();
+                     SetSampleChecksum(pSample, pSample->crc);
+                 }
+             }
+         }
+         return bRequiresSave;
+     }
      Group* File::GetFirstGroup() {
          if (!pGroups) LoadGroups();
          // there must always be at least one group
-Line 3069 
 namespace {
+Line 6931 
 namespace {
          return NULL;
      }
+     /**
+      * Returns the group with the given group name.
+      *
+      * Note: group names don't have to be unique in the gig format! So there
+      * can be multiple groups with the same name. This method will simply
+      * return the first group found with the given name.
+      *
+      * @param name - name of the sought group
+      * @returns sought group or NULL if there's no group with that name
+      */
+     Group* File::GetGroup(String name) {
+         if (!pGroups) LoadGroups();
+         GroupsIterator = pGroups->begin();
+         for (uint i = 0; GroupsIterator != pGroups->end(); ++GroupsIterator, ++i)
+             if ((*GroupsIterator)->Name == name) return *GroupsIterator;
+         return NULL;
+     }
      Group* File::AddGroup() {
          if (!pGroups) LoadGroups();
          // there must always be at least one group
-Line 3078 
 namespace {
+Line 6958 
 namespace {
          return pGroup;
      }
+     /** @brief Delete a group and its samples.
+      *
+      * This will delete the given Group object and all the samples that
+      * belong to this group from the gig file. You have to call Save() to
+      * make this persistent to the file.
+      *
+      * @param pGroup - group to delete
+      * @throws gig::Exception if given group could not be found
+      */
      void File::DeleteGroup(Group* pGroup) {
          if (!pGroups) LoadGroups();
          std::list<Group*>::iterator iter = find(pGroups->begin(), pGroups->end(), pGroup);
          if (iter == pGroups->end()) throw gig::Exception("Could not delete group, could not find given group");
          if (pGroups->size() == 1) throw gig::Exception("Cannot delete group, there must be at least one default group!");
+         // delete all members of this group
+         for (Sample* pSample = pGroup->GetFirstSample(); pSample; pSample = pGroup->GetNextSample()) {
+             DeleteSample(pSample);
+         }
+         // now delete this group object
+         pGroups->erase(iter);
+         pGroup->DeleteChunks();
+         delete pGroup;
+     }
+     /** @brief Delete a group.
+      *
+      * This will delete the given Group object from the gig file. All the
+      * samples that belong to this group will not be deleted, but instead
+      * be moved to another group. You have to call Save() to make this
+      * persistent to the file.
+      *
+      * @param pGroup - group to delete
+      * @throws gig::Exception if given group could not be found
+      */
+     void File::DeleteGroupOnly(Group* pGroup) {
+         if (!pGroups) LoadGroups();
+         std::list<Group*>::iterator iter = find(pGroups->begin(), pGroups->end(), pGroup);
+         if (iter == pGroups->end()) throw gig::Exception("Could not delete group, could not find given group");
+         if (pGroups->size() == 1) throw gig::Exception("Cannot delete group, there must be at least one default group!");
          // move all members of this group to another group
          pGroup->MoveAll();
          pGroups->erase(iter);
+         pGroup->DeleteChunks();
          delete pGroup;
      }
-Line 3096 
 namespace {
+Line 7011 
 namespace {
          if (lst3gri) {
              RIFF::List* lst3gnl = lst3gri->GetSubList(LIST_TYPE_3GNL);
              if (lst3gnl) {
-                 RIFF::Chunk* ck = lst3gnl->GetFirstSubChunk();
+                 size_t i = 0;
-                 while (ck) {
+                 for (RIFF::Chunk* ck = lst3gnl->GetSubChunkAt(i); ck;
+                      ck = lst3gnl->GetSubChunkAt(++i))
+                 {
                      if (ck->GetChunkID() == CHUNK_ID_3GNM) {
+                         if (pVersion && pVersion->major > 2 &&
+                             strcmp(static_cast<char*>(ck->LoadChunkData()), "") == 0) break;
                          pGroups->push_back(new Group(this, ck));
                      }
-                     ck = lst3gnl->GetNextSubChunk();
                  }
              }
          }
-Line 3113 
 namespace {
+Line 7032 
 namespace {
          }
      }
+     /** @brief Get instrument script group (by index).
+      *
+      * Returns the real-time instrument script group with the given index.
+      *
+      * @param index - number of the sought group (0..n)
+      * @returns sought script group or NULL if there's no such group
+      */
+     ScriptGroup* File::GetScriptGroup(uint index) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+         for (uint i = 0; it != pScriptGroups->end(); ++i, ++it)
+             if (i == index) return *it;
+         return NULL;
+     }
+     /** @brief Get instrument script group (by name).
+      *
+      * Returns the first real-time instrument script group found with the given
+      * group name. Note that group names may not necessarily be unique.
+      *
+      * @param name - name of the sought script group
+      * @returns sought script group or NULL if there's no such group
+      */
+     ScriptGroup* File::GetScriptGroup(const String& name) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+         for (uint i = 0; it != pScriptGroups->end(); ++i, ++it)
+             if ((*it)->Name == name) return *it;
+         return NULL;
+     }
+     /** @brief Add new instrument script group.
+      *
+      * Adds a new, empty real-time instrument script group to the file.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @return new empty script group
+      */
+     ScriptGroup* File::AddScriptGroup() {
+         if (!pScriptGroups) LoadScriptGroups();
+         ScriptGroup* pScriptGroup = new ScriptGroup(this, NULL);
+         pScriptGroups->push_back(pScriptGroup);
+         return pScriptGroup;
+     }
+     /** @brief Delete an instrument script group.
+      *
+      * This will delete the given real-time instrument script group and all its
+      * instrument scripts it contains. References inside instruments that are
+      * using the deleted scripts will be removed from the respective instruments
+      * accordingly.
+      *
+      * You have to call Save() to make this persistent to the file.
+      *
+      * @param pScriptGroup - script group to delete
+      * @throws gig::Exception if given script group could not be found
+      */
+     void File::DeleteScriptGroup(ScriptGroup* pScriptGroup) {
+         if (!pScriptGroups) LoadScriptGroups();
+         std::list<ScriptGroup*>::iterator iter =
+             find(pScriptGroups->begin(), pScriptGroups->end(), pScriptGroup);
+         if (iter == pScriptGroups->end())
+             throw gig::Exception("Could not delete script group, could not find given script group");
+         pScriptGroups->erase(iter);
+         for (int i = 0; pScriptGroup->GetScript(i); ++i)
+             pScriptGroup->DeleteScript(pScriptGroup->GetScript(i));
+         if (pScriptGroup->pList)
+             pScriptGroup->pList->GetParent()->DeleteSubChunk(pScriptGroup->pList);
+         pScriptGroup->DeleteChunks();
+         delete pScriptGroup;
+     }
+     void File::LoadScriptGroups() {
+         if (pScriptGroups) return;
+         pScriptGroups = new std::list<ScriptGroup*>;
+         RIFF::List* lstLS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (lstLS) {
+             size_t i = 0;
+             for (RIFF::List* lst = lstLS->GetSubListAt(i); lst;
+                  lst = lstLS->GetSubListAt(++i))
+             {
+                 if (lst->GetListType() == LIST_TYPE_RTIS) {
+                     pScriptGroups->push_back(new ScriptGroup(this, lst));
+                 }
+             }
+         }
+     }
+     /**
+      * Apply all the gig file's current instruments, samples, groups and settings
+      * to the respective RIFF chunks. You have to call Save() to make changes
+      * persistent.
+      *
+      * Usually there is absolutely no need to call this method explicitly.
+      * It will be called automatically when File::Save() was called.
+      *
+      * @param pProgress - callback function for progress notification
+      * @throws Exception - on errors
+      */
+     void File::UpdateChunks(progress_t* pProgress) {
+         bool newFile = pRIFF->GetSubList(LIST_TYPE_INFO) == NULL;
+         // update own gig format extension chunks
+         // (not part of the GigaStudio 4 format)
+         RIFF::List* lst3LS = pRIFF->GetSubList(LIST_TYPE_3LS);
+         if (!lst3LS) {
+             lst3LS = pRIFF->AddSubList(LIST_TYPE_3LS);
+         }
+         // Make sure <3LS > chunk is placed before <ptbl> chunk. The precise
+         // location of <3LS > is irrelevant, however it should be located
+         // before  the actual wave data
+         RIFF::Chunk* ckPTBL = pRIFF->GetSubChunk(CHUNK_ID_PTBL);
+         pRIFF->MoveSubChunk(lst3LS, ckPTBL);
+         // This must be performed before writing the chunks for instruments,
+         // because the instruments' script slots will write the file offsets
+         // of the respective instrument script chunk as reference.
+         if (pScriptGroups) {
+             // Update instrument script (group) chunks.
+             for (std::list<ScriptGroup*>::iterator it = pScriptGroups->begin();
+                  it != pScriptGroups->end(); ++it)
+             {
+                 (*it)->UpdateChunks(pProgress);
+             }
+         }
+         // in case no libgig custom format data was added, then remove the
+         // custom "3LS " chunk again
+         if (!lst3LS->CountSubChunks()) {
+             pRIFF->DeleteSubChunk(lst3LS);
+             lst3LS = NULL;
+         }
+         // first update base class's chunks
+         DLS::File::UpdateChunks(pProgress);
+         if (newFile) {
+             // INFO was added by Resource::UpdateChunks - make sure it
+             // is placed first in file
+             RIFF::Chunk* info = pRIFF->GetSubList(LIST_TYPE_INFO);
+             RIFF::Chunk* first = pRIFF->GetSubChunkAt(0);
+             if (first != info) {
+                 pRIFF->MoveSubChunk(info, first);
+             }
+         }
+         // update group's chunks
+         if (pGroups) {
+             // make sure '3gri' and '3gnl' list chunks exist
+             // (before updating the Group chunks)
+             RIFF::List* _3gri = pRIFF->GetSubList(LIST_TYPE_3GRI);
+             if (!_3gri) {
+                 _3gri = pRIFF->AddSubList(LIST_TYPE_3GRI);
+                 pRIFF->MoveSubChunk(_3gri, pRIFF->GetSubChunk(CHUNK_ID_PTBL));
+             }
+             RIFF::List* _3gnl = _3gri->GetSubList(LIST_TYPE_3GNL);
+             if (!_3gnl) _3gnl = _3gri->AddSubList(LIST_TYPE_3GNL);
+             // v3: make sure the file has 128 3gnm chunks
+             // (before updating the Group chunks)
+             if (pVersion && pVersion->major > 2) {
+                 size_t i = 0;
+                 for (RIFF::Chunk* _3gnm = _3gnl->GetSubChunkAt(i); i < 128;
+                      _3gnm = _3gnl->GetSubChunkAt(++i))
+                 {
+                     // create 128 empty placeholder strings which will either
+                     // be filled by Group::UpdateChunks below or left empty.
+                     ::SaveString(CHUNK_ID_3GNM, _3gnm, _3gnl, "", "", true, 64);
+                 }
+             }
+             std::list<Group*>::iterator iter = pGroups->begin();
+             std::list<Group*>::iterator end  = pGroups->end();
+             for (; iter != end; ++iter) {
+                 (*iter)->UpdateChunks(pProgress);
+             }
+         }
+         // update einf chunk
+         // The einf chunk contains statistics about the gig file, such
+         // as the number of regions and samples used by each
+         // instrument. It is divided in equally sized parts, where the
+         // first part contains information about the whole gig file,
+         // and the rest of the parts map to each instrument in the
+         // file.
+         //
+         // At the end of each part there is a bit map of each sample
+         // in the file, where a set bit means that the sample is used
+         // by the file/instrument.
+         //
+         // Note that there are several fields with unknown use. These
+         // are set to zero.
+         int sublen = int(pSamples->size() / 8 + 49);
+         int einfSize = (Instruments + 1) * sublen;
+         RIFF::Chunk* einf = pRIFF->GetSubChunk(CHUNK_ID_EINF);
+         if (einf) {
+             if (einf->GetSize() != einfSize) {
+                 einf->Resize(einfSize);
+                 memset(einf->LoadChunkData(), 0, einfSize);
+             }
+         } else if (newFile) {
+             einf = pRIFF->AddSubChunk(CHUNK_ID_EINF, einfSize);
+         }
+         if (einf) {
+             uint8_t* pData = (uint8_t*) einf->LoadChunkData();
+             std::map<gig::Sample*,int> sampleMap;
+             int sampleIdx = 0;
+             for (Sample* pSample = GetFirstSample(); pSample; pSample = GetNextSample()) {
+                 sampleMap[pSample] = sampleIdx++;
+             }
+             int totnbusedsamples = 0;
+             int totnbusedchannels = 0;
+             int totnbregions = 0;
+             int totnbdimregions = 0;
+             int totnbloops = 0;
+             int instrumentIdx = 0;
+             memset(&pData[48], 0, sublen - 48);
+             for (Instrument* instrument = GetFirstInstrument() ; instrument ;
+                  instrument = GetNextInstrument()) {
+                 int nbusedsamples = 0;
+                 int nbusedchannels = 0;
+                 int nbdimregions = 0;
+                 int nbloops = 0;
+                 memset(&pData[(instrumentIdx + 1) * sublen + 48], 0, sublen - 48);
+                 size_t iRgn = 0;
+                 for (Region* region = instrument->GetRegionAt(iRgn); region;
+                      region = instrument->GetRegionAt(++iRgn))
+                 {
+                     for (int i = 0 ; i < region->DimensionRegions ; i++) {
+                         gig::DimensionRegion *d = region->pDimensionRegions[i];
+                         if (d->pSample) {
+                             int sampleIdx = sampleMap[d->pSample];
+                             int byte = 48 + sampleIdx / 8;
+                             int bit = 1 << (sampleIdx & 7);
+                             if ((pData[(instrumentIdx + 1) * sublen + byte] & bit) == 0) {
+                                 pData[(instrumentIdx + 1) * sublen + byte] |= bit;
+                                 nbusedsamples++;
+                                 nbusedchannels += d->pSample->Channels;
+                                 if ((pData[byte] & bit) == 0) {
+                                     pData[byte] |= bit;
+                                     totnbusedsamples++;
+                                     totnbusedchannels += d->pSample->Channels;
+                                 }
+                             }
+                         }
+                         if (d->SampleLoops) nbloops++;
+                     }
+                     nbdimregions += region->DimensionRegions;
+                 }
+                 // first 4 bytes unknown - sometimes 0, sometimes length of einf part
+                 // store32(&pData[(instrumentIdx + 1) * sublen], sublen);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 4], nbusedchannels);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 8], nbusedsamples);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 12], 1);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 16], instrument->Regions);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 20], nbdimregions);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 24], nbloops);
+                 // next 8 bytes unknown
+                 store32(&pData[(instrumentIdx + 1) * sublen + 36], instrumentIdx);
+                 store32(&pData[(instrumentIdx + 1) * sublen + 40], (uint32_t) pSamples->size());
+                 // next 4 bytes unknown
+                 totnbregions += instrument->Regions;
+                 totnbdimregions += nbdimregions;
+                 totnbloops += nbloops;
+                 instrumentIdx++;
+             }
+             // first 4 bytes unknown - sometimes 0, sometimes length of einf part
+             // store32(&pData[0], sublen);
+             store32(&pData[4], totnbusedchannels);
+             store32(&pData[8], totnbusedsamples);
+             store32(&pData[12], Instruments);
+             store32(&pData[16], totnbregions);
+             store32(&pData[20], totnbdimregions);
+             store32(&pData[24], totnbloops);
+             // next 8 bytes unknown
+             // next 4 bytes unknown, not always 0
+             store32(&pData[40], (uint32_t) pSamples->size());
+             // next 4 bytes unknown
+         }
+         // update 3crc chunk
+         // The 3crc chunk contains CRC-32 checksums for the
+         // samples. When saving a gig file to disk, we first update the 3CRC
+         // chunk here (in RAM) with the old crc values which we read from the
+         // 3CRC chunk when we opened the file (available with gig::Sample::crc
+         // member variable). This step is required, because samples might have
+         // been deleted by the user since the file was opened, which in turn
+         // changes the order of the (i.e. old) checksums within the 3crc chunk.
+         // If a sample was conciously modified by the user (that is if
+         // Sample::Write() was called later on) then Sample::Write() will just
+         // update the respective individual checksum(s) directly on disk and
+         // leaves all other sample checksums untouched.
+         RIFF::Chunk* _3crc = pRIFF->GetSubChunk(CHUNK_ID_3CRC);
+         if (_3crc) {
+             _3crc->Resize(pSamples->size() * 8);
+         } else /*if (newFile)*/ {
+             _3crc = pRIFF->AddSubChunk(CHUNK_ID_3CRC, pSamples->size() * 8);
+             // the order of einf and 3crc is not the same in v2 and v3
+             if (einf && pVersion && pVersion->major > 2) pRIFF->MoveSubChunk(_3crc, einf);
+         }
+         { // must be performed in RAM here ...
+             uint32_t* pData = (uint32_t*) _3crc->LoadChunkData();
+             if (pData) {
+                 File::SampleList::iterator iter = pSamples->begin();
+                 File::SampleList::iterator end  = pSamples->end();
+                 for (int index = 0; iter != end; ++iter, ++index) {
+                     gig::Sample* pSample = (gig::Sample*) *iter;
+                     pData[index*2]   = 1; // always 1
+                     pData[index*2+1] = pSample->crc;
+                 }
+             }
+         }
+     }
+     void File::UpdateFileOffsets() {
+         DLS::File::UpdateFileOffsets();
+         for (Instrument* instrument = GetFirstInstrument(); instrument;
+              instrument = GetNextInstrument())
+         {
+             instrument->UpdateScriptFileOffsets();
+         }
+     }
+     /**
+      * Enable / disable automatic loading. By default this property is
+      * enabled and every information is loaded automatically. However
+      * loading all Regions, DimensionRegions and especially samples might
+      * take a long time for large .gig files, and sometimes one might only
+      * be interested in retrieving very superficial informations like the
+      * amount of instruments and their names. In this case one might disable
+      * automatic loading to avoid very slow response times.
+      *
+      * @e CAUTION: by disabling this property many pointers (i.e. sample
+      * references) and attributes will have invalid or even undefined
+      * data! This feature is currently only intended for retrieving very
+      * superficial information in a very fast way. Don't use it to retrieve
+      * details like synthesis information or even to modify .gig files!
+      */
+     void File::SetAutoLoad(bool b) {
+         bAutoLoad = b;
+     }
+     /**
+      * Returns whether automatic loading is enabled.
+      * @see SetAutoLoad()
+      */
+     bool File::GetAutoLoad() {
+         return bAutoLoad;
+     }
+     /**
+      * Returns @c true in case this gig File object uses any gig format
+      * extension, that is e.g. whether any DimensionRegion object currently
+      * has any setting effective that would require our "LSDE" RIFF chunk to
+      * be stored to the gig file.
+      *
+      * Right now this is a private method. It is considerable though this method
+      * to become (in slightly modified form) a public API method in future, i.e.
+      * to allow instrument editors to visualize and/or warn the user of any gig
+      * format extension being used. See also comments on
+      * DimensionRegion::UsesAnyGigFormatExtension() for details about such a
+      * potential public API change in future.
+      */
+     bool File::UsesAnyGigFormatExtension() const {
+         if (!pInstruments) return false;
+         InstrumentList::iterator iter = pInstruments->begin();
+         InstrumentList::iterator end  = pInstruments->end();
+         for (; iter != end; ++iter) {
+             Instrument* pInstrument = static_cast<gig::Instrument*>(*iter);
+             if (pInstrument->UsesAnyGigFormatExtension())
+                 return true;
+         }
+         return false;
+     }
  // *************** Exception ***************
  // *
-     Exception::Exception(String Message) : DLS::Exception(Message) {
+     Exception::Exception() : DLS::Exception() {
+     }
+     Exception::Exception(String format, ...) : DLS::Exception() {
+         va_list arg;
+         va_start(arg, format);
+         Message = assemble(format, arg);
+         va_end(arg);
+     }
+     Exception::Exception(String format, va_list arg) : DLS::Exception() {
+         Message = assemble(format, arg);
      }
      void Exception::PrintMessage() {

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+Added in v.3928

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