The Karplus-Strong plucked string algorithm: start with a buffer full of random noise and repeatedly play the contents of that buffer while averaging adjacent samples. High harmonics damp out more quickly, transfering their energy to lower ones. The length of the buffer corresponds to the length of the string. Fractional indexing is used to allow precise tuning; without this, the pitch would be rounded to the pitch corresponding to the nearest buffer size.

	copying
	copy copyRing

	initialization
	setPitch:dur:loudness:

	sound generation
	mixSampleCount:into:startingAt:leftVol:rightVol: reset samplesRemaining stopAfterMSecs:

	accessing	top
	duration Answer the duration of this sound in seconds.
	duration: Scale my envelopes to the given duration. Subclasses overriding this method should include a resend to super.

	copying	top
	copy A sound should copy all of the state needed to play itself, allowing two copies of a sound to play at the same time. These semantics require a recursive copy but only down to the level of immutable data. For example, a SampledSound need not copy its sample buffer. Subclasses overriding this method should include a resend to super.
	copyRing Private! Support for copying

	initialization	top
	setPitch:dur:loudness: Initialize my envelopes for the given parameters. Subclasses overriding this method should include a resend to super.

	sound generation	top
	mixSampleCount:into:startingAt:leftVol:rightVol: The Karplus-Strong plucked string algorithm: start with a buffer full of random noise and repeatedly play the contents of that buffer while averaging adjacent samples. High harmonics damp out more quickly, transfering their energy to lower ones. The length of the buffer corresponds to the length of the string.
	reset Fill the ring with random noise.
	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.
	stopAfterMSecs: Terminate this sound this note after the given number of milliseconds.

	instruments	top
	default PluckedSound default play