fix playback note durations in mixed chords

engine/items.py

@@ -492,7 +492,7 @@ class Duration(object):
             return value
 
     def noteOnAndOff(self, trackState, completeDuration):
-        """For GUI and Midi
+        """Midi only.
         return a tick value, the offset from an imaginary
         starting point on the tick/time axis, which needs to be
         added later. Think t=0 during this function.
@@ -593,8 +593,11 @@ class DurationGroup(object):
 
     Is compatible to Duration() methods and parameters.
 
-    For the representation and calculation always the minimum
-    note duration counts for the whole chord."""
+    Midi will send the actual note durations, per-note.
+    For the representation (GUI) and logical calculations always the minimum    
+    note duration counts for the whole chord.
+    
+    """
     def __init__(self, chord):
         self.chord = chord
         self.group = True
@@ -1347,7 +1350,6 @@ class Chord(Item):
             
             #newTicks = complDur / newparts                        
             note.duration = Duration.createByGuessing(Fraction(complDur, newparts))
-            
 
         #Now we have one note with the duration the user wants to have. Make n-1 copies-
         spawnedNotes = []
@@ -1652,7 +1654,7 @@ class Chord(Item):
         for note in self.notelist:
             velocity = note.dynamic.velocity(trackState)
             midipitch = pitchmath.toMidi[note.pitch]
-            onOffset, offOffset = note.duration.noteOnAndOff(trackState, dur)
+            onOffset, offOffset = note.duration.noteOnAndOff(trackState, note.duration.completeDuration())            
 
             if note.pitch in trackState.EXPORTtiedNoteExportObjectsWaitingForClosing: #this is the last or the middle in a tied note sequence (but not the first).
                 exportNoteList.append(note.exportObject(trackState))