/[svn]/linuxsampler/trunk/src/engines/gig/Voice.cpp
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Diff of /linuxsampler/trunk/src/engines/gig/Voice.cpp

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revision 796 by persson, Sun Oct 30 08:35:13 2005 UTC revision 841 by persson, Sat Mar 4 16:23:53 2006 UTC
# Line 3  Line 3 
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6   *   Copyright (C) 2005 Christian Schoenebeck                              *   *   Copyright (C) 2005, 2006 Christian Schoenebeck                        *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 104  namespace LinuxSampler { namespace gig { Line 104  namespace LinuxSampler { namespace gig {
104          // calculate volume          // calculate volume
105          const double velocityAttenuation = pDimRgn->GetVelocityAttenuation(itNoteOnEvent->Param.Note.Velocity);          const double velocityAttenuation = pDimRgn->GetVelocityAttenuation(itNoteOnEvent->Param.Note.Velocity);
106    
107          Volume = velocityAttenuation / 32768.0f; // we downscale by 32768 to convert from int16 value range to DSP value range (which is -1.0..1.0)          float volume = velocityAttenuation / 32768.0f; // we downscale by 32768 to convert from int16 value range to DSP value range (which is -1.0..1.0)
108    
109          Volume *= pDimRgn->SampleAttenuation;          volume *= pDimRgn->SampleAttenuation;
110    
111          // the volume of release triggered samples depends on note length          // the volume of release triggered samples depends on note length
112          if (Type == type_release_trigger) {          if (Type == type_release_trigger) {
# Line 114  namespace LinuxSampler { namespace gig { Line 114  namespace LinuxSampler { namespace gig {
114                                       pEngineChannel->pMIDIKeyInfo[MIDIKey].NoteOnTime) / pEngine->SampleRate;                                       pEngineChannel->pMIDIKeyInfo[MIDIKey].NoteOnTime) / pEngine->SampleRate;
115              float attenuation = 1 - 0.01053 * (256 >> pDimRgn->ReleaseTriggerDecay) * noteLength;              float attenuation = 1 - 0.01053 * (256 >> pDimRgn->ReleaseTriggerDecay) * noteLength;
116              if (attenuation <= 0) return -1;              if (attenuation <= 0) return -1;
117              Volume *= attenuation;              volume *= attenuation;
118          }          }
119    
120          // select channel mode (mono or stereo)          // select channel mode (mono or stereo)
121          SYNTHESIS_MODE_SET_CHANNELS(SynthesisMode, pSample->Channels == 2);          SYNTHESIS_MODE_SET_CHANNELS(SynthesisMode, pSample->Channels == 2);
122    
123          // get starting crossfade volume level          // get starting crossfade volume level
124            float crossfadeVolume;
125          switch (pDimRgn->AttenuationController.type) {          switch (pDimRgn->AttenuationController.type) {
126              case ::gig::attenuation_ctrl_t::type_channelaftertouch:              case ::gig::attenuation_ctrl_t::type_channelaftertouch:
127                  CrossfadeVolume = 1.0f; //TODO: aftertouch not supported yet                  crossfadeVolume = 1.0f; //TODO: aftertouch not supported yet
128                  break;                  break;
129              case ::gig::attenuation_ctrl_t::type_velocity:              case ::gig::attenuation_ctrl_t::type_velocity:
130                  CrossfadeVolume = CrossfadeAttenuation(itNoteOnEvent->Param.Note.Velocity);                  crossfadeVolume = Engine::CrossfadeCurve[CrossfadeAttenuation(itNoteOnEvent->Param.Note.Velocity)];
131                  break;                  break;
132              case ::gig::attenuation_ctrl_t::type_controlchange: //FIXME: currently not sample accurate              case ::gig::attenuation_ctrl_t::type_controlchange: //FIXME: currently not sample accurate
133                  CrossfadeVolume = CrossfadeAttenuation(pEngineChannel->ControllerTable[pDimRgn->AttenuationController.controller_number]);                  crossfadeVolume = Engine::CrossfadeCurve[CrossfadeAttenuation(pEngineChannel->ControllerTable[pDimRgn->AttenuationController.controller_number])];
134                  break;                  break;
135              case ::gig::attenuation_ctrl_t::type_none: // no crossfade defined              case ::gig::attenuation_ctrl_t::type_none: // no crossfade defined
136              default:              default:
137                  CrossfadeVolume = 1.0f;                  crossfadeVolume = 1.0f;
138          }          }
139    
140          PanLeft  = 1.0f - float(RTMath::Max(pDimRgn->Pan, 0)) /  63.0f;          VolumeLeft  = volume * Engine::PanCurve[64 - pDimRgn->Pan];
141          PanRight = 1.0f - float(RTMath::Min(pDimRgn->Pan, 0)) / -64.0f;          VolumeRight = volume * Engine::PanCurve[64 + pDimRgn->Pan];
142    
143            float subfragmentRate = pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE;
144            CrossfadeSmoother.trigger(crossfadeVolume, subfragmentRate);
145            VolumeSmoother.trigger(pEngineChannel->GlobalVolume, subfragmentRate);
146            PanLeftSmoother.trigger(pEngineChannel->GlobalPanLeft, subfragmentRate);
147            PanRightSmoother.trigger(pEngineChannel->GlobalPanRight, subfragmentRate);
148    
149          finalSynthesisParameters.dPos = pDimRgn->SampleStartOffset; // offset where we should start playback of sample (0 - 2000 sample points)          finalSynthesisParameters.dPos = pDimRgn->SampleStartOffset; // offset where we should start playback of sample (0 - 2000 sample points)
150          Pos = pDimRgn->SampleStartOffset;          Pos = pDimRgn->SampleStartOffset;
# Line 150  namespace LinuxSampler { namespace gig { Line 157  namespace LinuxSampler { namespace gig {
157              MaxRAMPos = cachedsamples - (pEngine->MaxSamplesPerCycle << CONFIG_MAX_PITCH) / pSample->Channels; //TODO: this calculation is too pessimistic and may better be moved to Render() method, so it calculates MaxRAMPos dependent to the current demand of sample points to be rendered (e.g. in case of JACK)              MaxRAMPos = cachedsamples - (pEngine->MaxSamplesPerCycle << CONFIG_MAX_PITCH) / pSample->Channels; //TODO: this calculation is too pessimistic and may better be moved to Render() method, so it calculates MaxRAMPos dependent to the current demand of sample points to be rendered (e.g. in case of JACK)
158    
159              // check if there's a loop defined which completely fits into the cached (RAM) part of the sample              // check if there's a loop defined which completely fits into the cached (RAM) part of the sample
160              if (pSample->Loops && pSample->LoopEnd <= MaxRAMPos) {              RAMLoop = (pSample->Loops && pSample->LoopEnd <= MaxRAMPos);
                 RAMLoop            = true;  
                 loop.uiTotalCycles = pSample->LoopPlayCount;  
                 loop.uiCyclesLeft  = pSample->LoopPlayCount;  
                 loop.uiStart       = pSample->LoopStart;  
                 loop.uiEnd         = pSample->LoopEnd;  
                 loop.uiSize        = pSample->LoopSize;  
             }  
             else RAMLoop = false;  
161    
162              if (pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos, !RAMLoop) < 0) {              if (pDiskThread->OrderNewStream(&DiskStreamRef, pSample, MaxRAMPos, !RAMLoop) < 0) {
163                  dmsg(1,("Disk stream order failed!\n"));                  dmsg(1,("Disk stream order failed!\n"));
# Line 169  namespace LinuxSampler { namespace gig { Line 168  namespace LinuxSampler { namespace gig {
168          }          }
169          else { // RAM only voice          else { // RAM only voice
170              MaxRAMPos = cachedsamples;              MaxRAMPos = cachedsamples;
171              if (pSample->Loops) {              RAMLoop = (pSample->Loops != 0);
                 RAMLoop           = true;  
                 loop.uiCyclesLeft = pSample->LoopPlayCount;  
             }  
             else RAMLoop = false;  
172              dmsg(4,("RAM only voice launched (Looping: %s)\n", (RAMLoop) ? "yes" : "no"));              dmsg(4,("RAM only voice launched (Looping: %s)\n", (RAMLoop) ? "yes" : "no"));
173          }          }
174            if (RAMLoop) {
175                loop.uiTotalCycles = pSample->LoopPlayCount;
176                loop.uiCyclesLeft  = pSample->LoopPlayCount;
177                loop.uiStart       = pSample->LoopStart;
178                loop.uiEnd         = pSample->LoopEnd;
179                loop.uiSize        = pSample->LoopSize;
180            }
181    
182          // calculate initial pitch value          // calculate initial pitch value
183          {          {
# Line 229  namespace LinuxSampler { namespace gig { Line 230  namespace LinuxSampler { namespace gig {
230                          pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);                          pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);
231          }          }
232    
233    #ifdef CONFIG_INTERPOLATE_VOLUME
234            // setup initial volume in synthesis parameters
235    #ifdef CONFIG_PROCESS_MUTED_CHANNELS
236            if (pEngineChannel->GetMute()) {
237                finalSynthesisParameters.fFinalVolumeLeft  = 0;
238                finalSynthesisParameters.fFinalVolumeRight = 0;
239            }
240            else
241    #else
242            {
243                float finalVolume = pEngineChannel->GlobalVolume * crossfadeVolume * EG1.getLevel();
244    
245                finalSynthesisParameters.fFinalVolumeLeft  = finalVolume * VolumeLeft  * pEngineChannel->GlobalPanLeft;
246                finalSynthesisParameters.fFinalVolumeRight = finalVolume * VolumeRight * pEngineChannel->GlobalPanRight;
247            }
248    #endif
249    #endif
250    
251          // setup EG 2 (VCF Cutoff EG)          // setup EG 2 (VCF Cutoff EG)
252          {          {
# Line 270  namespace LinuxSampler { namespace gig { Line 288  namespace LinuxSampler { namespace gig {
288    
289          // setup EG 3 (VCO EG)          // setup EG 3 (VCO EG)
290          {          {
291            double eg3depth = RTMath::CentsToFreqRatio(pDimRgn->EG3Depth);              // if portamento mode is on, we dedicate EG3 purely for portamento, otherwise if portamento is off we do as told by the patch
292            EG3.trigger(eg3depth, pDimRgn->EG3Attack, pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);              bool  bPortamento = pEngineChannel->PortamentoMode && pEngineChannel->PortamentoPos >= 0.0f;
293                float eg3depth = (bPortamento)
294                                     ? RTMath::CentsToFreqRatio((pEngineChannel->PortamentoPos - (float) MIDIKey) * 100)
295                                     : RTMath::CentsToFreqRatio(pDimRgn->EG3Depth);
296                float eg3time = (bPortamento)
297                                    ? pEngineChannel->PortamentoTime
298                                    : pDimRgn->EG3Attack;
299                EG3.trigger(eg3depth, eg3time, pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);
300                dmsg(5,("PortamentoPos=%f, depth=%f, time=%f\n", pEngineChannel->PortamentoPos, eg3depth, eg3time));
301          }          }
302    
303    
# Line 309  namespace LinuxSampler { namespace gig { Line 335  namespace LinuxSampler { namespace gig {
335                      pLFO1->ExtController = 0; // no external controller                      pLFO1->ExtController = 0; // no external controller
336                      bLFO1Enabled         = false;                      bLFO1Enabled         = false;
337              }              }
338              if (bLFO1Enabled) pLFO1->trigger(pDimRgn->LFO1Frequency,              if (bLFO1Enabled) {
339                                               start_level_max,                  pLFO1->trigger(pDimRgn->LFO1Frequency,
340                                               lfo1_internal_depth,                                 start_level_max,
341                                               pDimRgn->LFO1ControlDepth,                                 lfo1_internal_depth,
342                                               pDimRgn->LFO1FlipPhase,                                 pDimRgn->LFO1ControlDepth,
343                                               pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);                                 pDimRgn->LFO1FlipPhase,
344                                   pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);
345                    pLFO1->update(pLFO1->ExtController ? pEngineChannel->ControllerTable[pLFO1->ExtController] : 0);
346                }
347          }          }
348    
349    
# Line 352  namespace LinuxSampler { namespace gig { Line 381  namespace LinuxSampler { namespace gig {
381                      pLFO2->ExtController = 0; // no external controller                      pLFO2->ExtController = 0; // no external controller
382                      bLFO2Enabled         = false;                      bLFO2Enabled         = false;
383              }              }
384              if (bLFO2Enabled) pLFO2->trigger(pDimRgn->LFO2Frequency,              if (bLFO2Enabled) {
385                                               start_level_max,                  pLFO2->trigger(pDimRgn->LFO2Frequency,
386                                               lfo2_internal_depth,                                 start_level_max,
387                                               pDimRgn->LFO2ControlDepth,                                 lfo2_internal_depth,
388                                               pDimRgn->LFO2FlipPhase,                                 pDimRgn->LFO2ControlDepth,
389                                               pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);                                 pDimRgn->LFO2FlipPhase,
390                                   pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);
391                    pLFO2->update(pLFO2->ExtController ? pEngineChannel->ControllerTable[pLFO2->ExtController] : 0);
392                }
393          }          }
394    
395    
# Line 395  namespace LinuxSampler { namespace gig { Line 427  namespace LinuxSampler { namespace gig {
427                      pLFO3->ExtController = 0; // no external controller                      pLFO3->ExtController = 0; // no external controller
428                      bLFO3Enabled         = false;                      bLFO3Enabled         = false;
429              }              }
430              if (bLFO3Enabled) pLFO3->trigger(pDimRgn->LFO3Frequency,              if (bLFO3Enabled) {
431                                               start_level_mid,                  pLFO3->trigger(pDimRgn->LFO3Frequency,
432                                               lfo3_internal_depth,                                 start_level_mid,
433                                               pDimRgn->LFO3ControlDepth,                                 lfo3_internal_depth,
434                                               false,                                 pDimRgn->LFO3ControlDepth,
435                                               pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);                                 false,
436                                   pEngine->SampleRate / CONFIG_DEFAULT_SUBFRAGMENT_SIZE);
437                    pLFO3->update(pLFO3->ExtController ? pEngineChannel->ControllerTable[pLFO3->ExtController] : 0);
438                }
439          }          }
440    
441    
# Line 638  namespace LinuxSampler { namespace gig { Line 673  namespace LinuxSampler { namespace gig {
673       * for the given time.       * for the given time.
674       *       *
675       * @param itEvent - iterator pointing to the next event to be processed       * @param itEvent - iterator pointing to the next event to be processed
676       * @param End     - youngest time stamp where processing should be stopped       * @param End     - youngest time stamp where processing should be stopped
677       */       */
678      void Voice::processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End) {      void Voice::processTransitionEvents(RTList<Event>::Iterator& itEvent, uint End) {
679          for (; itEvent && itEvent->FragmentPos() <= End; ++itEvent) {          for (; itEvent && itEvent->FragmentPos() <= End; ++itEvent) {
# Line 657  namespace LinuxSampler { namespace gig { Line 692  namespace LinuxSampler { namespace gig {
692       * the given time.       * the given time.
693       *       *
694       * @param itEvent - iterator pointing to the next event to be processed       * @param itEvent - iterator pointing to the next event to be processed
695       * @param End     - youngest time stamp where processing should be stopped       * @param End     - youngest time stamp where processing should be stopped
696       */       */
697      void Voice::processCCEvents(RTList<Event>::Iterator& itEvent, uint End) {      void Voice::processCCEvents(RTList<Event>::Iterator& itEvent, uint End) {
698          for (; itEvent && itEvent->FragmentPos() <= End; ++itEvent) {          for (; itEvent && itEvent->FragmentPos() <= End; ++itEvent) {
# Line 680  namespace LinuxSampler { namespace gig { Line 715  namespace LinuxSampler { namespace gig {
715                  }                  }
716                  if (pDimRgn->AttenuationController.type == ::gig::attenuation_ctrl_t::type_controlchange &&                  if (pDimRgn->AttenuationController.type == ::gig::attenuation_ctrl_t::type_controlchange &&
717                      itEvent->Param.CC.Controller == pDimRgn->AttenuationController.controller_number) {                      itEvent->Param.CC.Controller == pDimRgn->AttenuationController.controller_number) {
718                      processCrossFadeEvent(itEvent);                      CrossfadeSmoother.update(Engine::CrossfadeCurve[CrossfadeAttenuation(itEvent->Param.CC.Value)]);
719                    }
720                    if (itEvent->Param.CC.Controller == 7) { // volume
721                        VolumeSmoother.update(Engine::VolumeCurve[itEvent->Param.CC.Value] * CONFIG_GLOBAL_ATTENUATION);
722                    } else if (itEvent->Param.CC.Controller == 10) { // panpot
723                        PanLeftSmoother.update(Engine::PanCurve[128 - itEvent->Param.CC.Value]);
724                        PanRightSmoother.update(Engine::PanCurve[itEvent->Param.CC.Value]);
725                  }                  }
726              } else if (itEvent->Type == Event::type_pitchbend) { // if pitch bend event              } else if (itEvent->Type == Event::type_pitchbend) { // if pitch bend event
727                  processPitchEvent(itEvent);                  processPitchEvent(itEvent);
# Line 694  namespace LinuxSampler { namespace gig { Line 735  namespace LinuxSampler { namespace gig {
735          PitchBend = pitch;          PitchBend = pitch;
736      }      }
737    
     void Voice::processCrossFadeEvent(RTList<Event>::Iterator& itEvent) {  
         CrossfadeVolume = CrossfadeAttenuation(itEvent->Param.CC.Value);  
         #if CONFIG_PROCESS_MUTED_CHANNELS  
         const float effectiveVolume = CrossfadeVolume * Volume * (pEngineChannel->GetMute() ? 0 : pEngineChannel->GlobalVolume);  
         #else  
         const float effectiveVolume = CrossfadeVolume * Volume * pEngineChannel->GlobalVolume;  
         #endif  
         fFinalVolume = effectiveVolume;  
     }  
   
738      void Voice::processCutoffEvent(RTList<Event>::Iterator& itEvent) {      void Voice::processCutoffEvent(RTList<Event>::Iterator& itEvent) {
739          int ccvalue = itEvent->Param.CC.Value;          int ccvalue = itEvent->Param.CC.Value;
740          if (VCFCutoffCtrl.value == ccvalue) return;          if (VCFCutoffCtrl.value == ccvalue) return;
# Line 759  namespace LinuxSampler { namespace gig { Line 790  namespace LinuxSampler { namespace gig {
790    
791              // initialize all final synthesis parameters              // initialize all final synthesis parameters
792              finalSynthesisParameters.fFinalPitch = PitchBase * PitchBend;              finalSynthesisParameters.fFinalPitch = PitchBase * PitchBend;
             #if CONFIG_PROCESS_MUTED_CHANNELS  
             fFinalVolume = this->Volume * this->CrossfadeVolume * (pEngineChannel->GetMute() ? 0 : pEngineChannel->GlobalVolume);  
             #else  
             fFinalVolume = this->Volume * this->CrossfadeVolume * pEngineChannel->GlobalVolume;  
             #endif  
793              fFinalCutoff    = VCFCutoffCtrl.fvalue;              fFinalCutoff    = VCFCutoffCtrl.fvalue;
794              fFinalResonance = VCFResonanceCtrl.fvalue;              fFinalResonance = VCFResonanceCtrl.fvalue;
795    
796              // process MIDI control change and pitchbend events for this subfragment              // process MIDI control change and pitchbend events for this subfragment
797              processCCEvents(itCCEvent, iSubFragmentEnd);              processCCEvents(itCCEvent, iSubFragmentEnd);
798    
799                float fFinalVolume = VolumeSmoother.render() * CrossfadeSmoother.render();
800    #ifdef CONFIG_PROCESS_MUTED_CHANNELS
801                if (pEngineChannel->GetMute()) fFinalVolume = 0;
802    #endif
803    
804              // process transition events (note on, note off & sustain pedal)              // process transition events (note on, note off & sustain pedal)
805              processTransitionEvents(itNoteEvent, iSubFragmentEnd);              processTransitionEvents(itNoteEvent, iSubFragmentEnd);
806    
# Line 802  namespace LinuxSampler { namespace gig { Line 833  namespace LinuxSampler { namespace gig {
833                      fFinalCutoff *= EG2.getLevel();                      fFinalCutoff *= EG2.getLevel();
834                      break; // noop                      break; // noop
835              }              }
836              if (EG3.active()) finalSynthesisParameters.fFinalPitch *= RTMath::CentsToFreqRatio(EG3.render());              if (EG3.active()) finalSynthesisParameters.fFinalPitch *= EG3.render();
837    
838              // process low frequency oscillators              // process low frequency oscillators
839              if (bLFO1Enabled) fFinalVolume *= pLFO1->render();              if (bLFO1Enabled) fFinalVolume *= pLFO1->render();
# Line 823  namespace LinuxSampler { namespace gig { Line 854  namespace LinuxSampler { namespace gig {
854              SYNTHESIS_MODE_SET_INTERPOLATE(SynthesisMode, bResamplingRequired);              SYNTHESIS_MODE_SET_INTERPOLATE(SynthesisMode, bResamplingRequired);
855    
856              // prepare final synthesis parameters structure              // prepare final synthesis parameters structure
             finalSynthesisParameters.fFinalVolumeLeft  = fFinalVolume * PanLeft;  
             finalSynthesisParameters.fFinalVolumeRight = fFinalVolume * PanRight;  
857              finalSynthesisParameters.uiToGo            = iSubFragmentEnd - i;              finalSynthesisParameters.uiToGo            = iSubFragmentEnd - i;
858    #ifdef CONFIG_INTERPOLATE_VOLUME
859                finalSynthesisParameters.fFinalVolumeDeltaLeft  =
860                    (fFinalVolume * VolumeLeft  * PanLeftSmoother.render() -
861                     finalSynthesisParameters.fFinalVolumeLeft) / finalSynthesisParameters.uiToGo;
862                finalSynthesisParameters.fFinalVolumeDeltaRight =
863                    (fFinalVolume * VolumeRight * PanRightSmoother.render() -
864                     finalSynthesisParameters.fFinalVolumeRight) / finalSynthesisParameters.uiToGo;
865    #else
866                finalSynthesisParameters.fFinalVolumeLeft  =
867                    fFinalVolume * VolumeLeft  * PanLeftSmoother.render();
868                finalSynthesisParameters.fFinalVolumeRight =
869                    fFinalVolume * VolumeRight * PanRightSmoother.render();
870    #endif
871              // render audio for one subfragment              // render audio for one subfragment
872              RunSynthesisFunction(SynthesisMode, &finalSynthesisParameters, &loop);              RunSynthesisFunction(SynthesisMode, &finalSynthesisParameters, &loop);
873    
874                // stop the rendering if volume EG is finished
875                if (EG1.getSegmentType() == EGADSR::segment_end) break;
876    
877              const double newPos = Pos + (iSubFragmentEnd - i) * finalSynthesisParameters.fFinalPitch;              const double newPos = Pos + (iSubFragmentEnd - i) * finalSynthesisParameters.fFinalPitch;
878    
879              // increment envelopes' positions              // increment envelopes' positions
# Line 855  namespace LinuxSampler { namespace gig { Line 899  namespace LinuxSampler { namespace gig {
899          }          }
900      }      }
901    
902        /** @brief Update current portamento position.
903         *
904         * Will be called when portamento mode is enabled to get the final
905         * portamento position of this active voice from where the next voice(s)
906         * might continue to slide on.
907         *
908         * @param itNoteOffEvent - event which causes this voice to die soon
909         */
910        void Voice::UpdatePortamentoPos(Pool<Event>::Iterator& itNoteOffEvent) {
911            const float fFinalEG3Level = EG3.level(itNoteOffEvent->FragmentPos());
912            pEngineChannel->PortamentoPos = (float) MIDIKey + RTMath::FreqRatioToCents(fFinalEG3Level) * 0.01f;
913        }
914    
915      /**      /**
916       *  Immediately kill the voice. This method should not be used to kill       *  Immediately kill the voice. This method should not be used to kill
917       *  a normal, active voice, because it doesn't take care of things like       *  a normal, active voice, because it doesn't take care of things like
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