This class and its subclasses act to syncronize movie players with the progress of a MIDI score and further background can be found in the comment for MoviePlayerMorph.

There are two main forms of synchroniztion.

MovieFrameSyncMorphs are used where you have a MIDI score open with a piano roll, and a separate MoviePlayer Morph. A MovieFrameSyncMorph can be torn off from the MoviePlayer with a shift-drag gesture or menu command, and can then be dropped into a MIDI score. They are used to start a movie player at a given place in the score, and then to stretch or compress the movie frame rate so that certain frames are synchronized with the corresponding points in the score.

MovieClipStartMorphs (q.v.) and MovieClipEndMorphs are used for the other kind of synchronization, namely where you wish to assemble a number of movie clips in a sequence.

	drawing
	addMorphsTo:pianoRoll:eventTime:betweenTime:and:

	events
	encounteredAtTime:inScorePlayer:atIndex:inEventTrack:secsPerTick: nextSyncEventAfter:inTrack: pauseFrom: resetFrom: resumeFrom:

	initialization
	image:player:frameNumber: justDroppedInto:event: justDroppedIntoPianoRoll:event:

	access	top
	frameNumber
	moviePlayerMorph
	relatedPlayer

	drawing	top
	addMorphsTo:pianoRoll:eventTime:betweenTime:and: a hack to allow for abitrary morphs to be dropped into piano roll

	events	top
	encounteredAtTime:inScorePlayer:atIndex:inEventTrack:secsPerTick: Set frame number and milliseconds since start in case of drift
	nextSyncEventAfter:inTrack:
	pauseFrom: subclasses should take five
	resetFrom: subclasses should revert to their initial state
	resumeFrom: subclasses should continue from their current position

	initialization	top
	image:player:frameNumber:
	justDroppedInto:event: When dropping this morph into a pianoRoll, add a corresponding event to the score so that it will always appear when played, in addition to possibly triggering other actions
	justDroppedIntoPianoRoll:event: since these morphs handle their own dropping, ignore