This is a real-time player for MIDI scores (i.e., scores read from MIDI files). Score can be played using either the internal sound synthesis or an external MIDI synthesizer on platforms that support MIDI output.

	copying
	copy copySounds

	initialization
	initialize onScore: updateDuration

	midi output
	closeMIDIPort midiPlayLoop openMIDIPort: processMIDIEventsAtTick: startMIDIPlaying stopMIDIPlaying turnOffActiveMIDINotesAt:

	operating
	disableReverb: pause resumePlaying tempoOrRateChanged

	sound generation
	doControl isDone isPlaying jumpToTick: mixSampleCount:into:startingAt:leftVol:rightVol: processAllAtTick: processAmbientEventsAtTick: processNoteEventsAtTick: processTempoMapAtTick: reset samplesRemaining skipAmbientEventsThruTick: skipNoteEventsThruTick: startNote:forStartTick:trackIndex:

	volume
	adjustVolumeTo:overMSecs:

	accessing	top
	durationInTicks
	infoForTrack: Return the info string for the given track.
	instrumentForTrack:
	instrumentForTrack:put:
	midiPort
	millisecondsSinceStart Answer the approximate number of milliseconds of real time since the beginning of the score. Since this calculation uses the current tempo, which can change throughout the piece, it is safer to use ticksSinceStart for synchronization.
	mutedForTrack:
	mutedForTrack:put:
	mutedState
	overallVolume
	overallVolume: Set the overally playback volume to a value between 0.0 (off) and 1.0 (full blast).
	panForTrack:
	panForTrack:put: Set the left-right pan for this track to a value in the range [0.0..1.0], where 0.0 means full-left.
	positionInScore
	positionInScore:
	rate
	rate: Set the playback rate. For example, a rate of 2.0 will playback at twice normal speed.
	repeat Return true if this player will repeat when it gets to the end of the score, false otherwise.
	repeat: Turn repeat mode on or off.
	score
	secsPerTick
	settingsString
	tempo Return the current tempo in beats (quarter notes) per minute. The tempo at any given moment is defined by the score and cannot be changed by the client. To change the playback speed, the client may change the rate parameter.
	ticksForMSecs:
	ticksSinceStart Answer the number of score ticks that have elapsed since this piece started playing. The duration of a tick is determined by the MIDI score.
	ticksSinceStart: Adjust ticks to folow, eg, piano roll autoscrolling
	trackCount
	volumeForTrack:
	volumeForTrack:put:

	copying	top
	copy Copy my component sounds.
	copySounds Private! Support for copying.

	initialization	top
	initialize
	onScore:
	updateDuration

	midi output	top
	closeMIDIPort Stop using MIDI for output. Music will be played using the built-in sound synthesis.
	midiPlayLoop
	openMIDIPort: Open the given MIDI port. Music will be played as MIDI commands to the given MIDI port.
	processMIDIEventsAtTick: Process note events through the given score tick using MIDI.
	startMIDIPlaying Start up a process to play this score via MIDI.
	stopMIDIPlaying Terminate the MIDI player process and turn off any active notes.
	turnOffActiveMIDINotesAt: Turn off any active MIDI notes that should be turned off at the given score tick.

	operating	top
	disableReverb:
	pause Pause this sound. It can be resumed from this point, or reset and resumed to start from the beginning.
	resumePlaying Resume playing. Start over if done.
	tempoOrRateChanged This method should be called after changing the tempo or rate.

	sound generation	top
	doControl Update the control parameters of this sound using its envelopes, if any.
	isDone
	isPlaying Return true if the receiver is currently playing
	jumpToTick:
	mixSampleCount:into:startingAt:leftVol:rightVol: Play a number of sounds concurrently. The level of each sound can be set independently for the left and right channels.
	processAllAtTick:
	processAmbientEventsAtTick: Process ambient events through the given tick.
	processNoteEventsAtTick: Process note events through the given score tick using internal Squeak sound synthesis.
	processTempoMapAtTick: Process tempo changes through the given score tick.
	reset Reset my internal state for a replay. Methods that override this method should do super reset.
	samplesRemaining Answer the number of samples remaining until the end of this sound. A sound with an indefinite ending time should answer some large integer such as 1000000.
	skipAmbientEventsThruTick: Skip ambient events through the given score tick.
	skipNoteEventsThruTick: Skip note events through the given score tick using internal Squeak sound synthesis.
	startNote:forStartTick:trackIndex: Prepare a note to begin playing at the given tick. Used to start playing at an arbitrary point in the score. Handle both MIDI and built-in synthesis cases.

	volume	top
	adjustVolumeTo:overMSecs: Adjust the volume of this sound to the given volume, a number in the range [0.0..1.0], over the given number of milliseconds. The volume will be changed a little bit on each sample until the desired volume is reached.

	instance creation	top
	onScore: