AW: VC envelopes

[Haible Juergen]

	>That reminds me of switched capacitors. Wouldn't that be usable for
ADSRs?
	>Having a quasi-variable capacitor, with a moderately high operating
	>frequency (compared to audio). Time constants would be controlled
from a
	>reference voltage by PWMing a fixed saw osc. Or is this just what
is done
	>in the JP-4?

It's different. The VCO is built around a few CMOs inverters and a discrete
transistor pair. It produces a short spike (narrow pulse) with pulse lenght
independent of frequency. Change the frequency, change the number of pulses
per time unit, change the average current thru the cmos switch.

JH.