Represents a note on or off event in a MIDI score.

	classification
	isNoteEvent

	midi
	endNoteOnMidiPort: startNoteOnMidiPort:

	printing
	keyName printOn:

	accessing	top
	channel
	channel:
	duration
	duration:
	endTime Subclasses should override to return the ending time if the event has some duration.
	key:velocity:channel:
	midiKey
	midiKey:
	pitch Convert my MIDI key number to a pitch and return it.
	velocity
	velocity:

	classification	top
	isNoteEvent

	midi	top
	endNoteOnMidiPort: Output a noteOff event to the given MIDI port. (Actually, output a noteOff event with zero velocity. This does the same thing, but allows running status to be used when sending a mixture of note on and off commands.)
	startNoteOnMidiPort: Output a noteOn event to the given MIDI port.

	printing	top
	keyName Return a note name for my pitch.
	printOn: Append to the argument, aStream, a sequence of characters that identifies the receiver.