ADSR envelope of synths seems to self trigger?

[abramhindle]

Synth's ADSR bounces after released. It doesn't calm down to 0.

syn = Synth({
	useADSR: true,
  	triggerRelease: true,
}).connect()
syn.note(440)
 // why is the envelope bouncing?
setTimeout( () => syn.env.release(), 1000)

So after about 2 seconds we shouldn't hear anything, yet we do.

Branch v3.