--- linuxsampler/trunk/src/engines/EngineChannelBase.h	2009/10/23 17:53:17	2012
+++ linuxsampler/trunk/src/engines/EngineChannelBase.h	2010/02/28 07:28:56	2063
@@ -347,6 +347,42 @@
             }
 
             virtual void ProcessKeySwitchChange(int key) = 0;
+
+            /**
+             * Handle key group (a.k.a. exclusive group) conflicts
+             */
+        void HandleKeyGroupConflicts(uint KeyGroup, Pool<Event>::Iterator& itNoteOnEvent, bool UseRelease = false) {
+                if (KeyGroup) { // if this voice / key belongs to a key group
+                    uint* pKeyGroup = MidiKeyboardManager<V>::ActiveKeyGroups[KeyGroup];
+                    if (pKeyGroup) { // if there's already an active key in that key group
+                        MidiKey* pOtherKey = &MidiKeyboardManager<V>::pMIDIKeyInfo[*pKeyGroup];
+
+                        if (UseRelease) {
+                            // send a note off to the other key
+                            if (pOtherKey->KeyPressed && itNoteOnEvent->Param.Note.Key != *pKeyGroup) {
+                                RTList<Event>::Iterator itNewEvent = pEngine->pGlobalEvents->allocAppend();
+                                if (itNewEvent) {
+                                    pOtherKey->ReleaseTrigger = false;
+                                    *itNewEvent = *itNoteOnEvent;
+                                    itNewEvent->Type = Event::type_note_off;
+                                    itNewEvent->Param.Note.Key = *pKeyGroup;
+                                    pEngine->ProcessNoteOff(this, itNewEvent);
+                                }
+                            }
+                        } else {
+                            // kill all voices on the (other) key
+                            typename RTList<V>::Iterator itVoiceToBeKilled = pOtherKey->pActiveVoices->first();
+                            typename RTList<V>::Iterator end               = pOtherKey->pActiveVoices->end();
+                            for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {
+                                if (itVoiceToBeKilled->Type != Voice::type_release_trigger) {
+                                    itVoiceToBeKilled->Kill(itNoteOnEvent);
+                                    --pEngine->VoiceSpawnsLeft; //FIXME: just a hack, we should better check in StealVoice() if the voice was killed due to key conflict
+                                }
+                            }
+                        }
+                    }
+                }
+            }
     };
 
 } // namespace LinuxSampler