A ScorePlayerMorph mediates between a score such as a MIDIScore, a PianoRollScoreMorph, and the actual SoundPlayer synthesizer.

It provides control over volume, tempo, instrumentation, and location in the score.

	controls
	atTrack:from:selectInstrument: rewind setLogRate:

	initialization
	closeMIDIPort initialize onScorePlayer:title: openMIDIFile openMIDIPort wantsRoundedCorners

	layout
	makeControls makeMIDIController: makePianoRoll makeRow panAndVolControlsFor: rateControl scrollControl showResumeButtonInTheWorld standaloneResumeButton trackControlsFor: trackNumAndMuteButtonFor: volumeControl

	menu
	instrumentChoicesForTrack: invokeMenu makeAPauseEvent: updateInstrumentsFromLibraryExcept:

	object fileIn

	stepping
	step

	accessing	top
	scorePlayer

	controls	top
	atTrack:from:selectInstrument:
	rewind
	setLogRate:

	initialization	top
	closeMIDIPort
	initialize
	onScorePlayer:title:
	openMIDIFile Open a MIDI score and re-init controls...
	openMIDIPort
	wantsRoundedCorners Default response is simple, fast, and false. May be overridden to allow almost any morph to be rounded.

	layout	top
	makeControls
	makeMIDIController:
	makePianoRoll Create a piano roll viewer for this score player.
	makeRow
	panAndVolControlsFor:
	rateControl
	scrollControl
	showResumeButtonInTheWorld
	standaloneResumeButton
	trackControlsFor:
	trackNumAndMuteButtonFor:
	volumeControl

	menu	top
	instrumentChoicesForTrack:
	invokeMenu Invoke a menu of additonal functions for this WaveEditor.
	makeAPauseEvent:
	updateInstrumentsFromLibraryExcept: The instrument library has been modified. Update my instruments with the new versions from the library. Use a single instrument prototype for all parts with the same name; this allows the envelope editor to edit all the parts by changing a single sound prototype.

object fileIn

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	stepping	top
	step Do some periodic activity. Use startStepping/stopStepping to start and stop getting sent this message. The time between steps is specified by this morph's answer to the stepTime message. The generic version dispatches control to the player, if any. The nasty circumlocation about owner's transformation is necessitated by the flexing problem that the player remains in the properties dictionary both of the flex and the real morph. In the current architecture, only the top renderer's pointer to the player should actually be honored for the purpose of firing.

	as yet unclassified	top
	descriptionForPartsBin If the receiver is a member of a class that would like to be represented in a parts bin, answer the name by which it should be known, and a documentation string to be provided, for example, as balloon help. When the 'nativitySelector' is sent to the 'globalReceiver', it is expected that some kind of Morph will result. The parameters used in the implementation below are for documentation purposes only!
	onMIDIFileNamed: Return a ScorePlayerMorph on the score from the MIDI file of the given name.
	openOn:title: