addMorphsTo:pianoRoll:eventTime:betweenTime:and:

a hack to allow for abitrary morphs to be dropped into piano roll

encounteredAtTime:inScorePlayer:atIndex:inEventTrack:secsPerTick:

hack... since we are called from within the SoundPlayer loop, the Semaphore will
block attempts to play directly from here

initialize

justDroppedIntoPianoRoll:event:

releaseCachedState

Release any state that can be recomputed on demand, such as the pixel values for a color gradient or the editor state for a TextMorph. This method may be called to save space when a morph becomes inaccessible. Implementations of this method should do 'super releaseCachedState'.

sound: