[sdiy] analog clap details

[gregory zifcak]

hi all,

how about some more flexible analog applause?

the 909, 808, cr-8000, and tama techstar claps are all very similar: 
filtered noise through a VCA controlled by a decay envelope (reverb) mixed 
with same filtered noise through a VCA controlled by a quadruple AD envelope 
(clap impulses).

what i'm wondering is, is the timing of these envelopes determined by a 
single common RC network? i don't know enough to suss out how the circuit's 
working.

i'd like to be able to control the timing with a single pot, for tighter or 
looser claps.

description and schem of the 909 clap are here: 
http://hardware.freepage.de/raf909/ (click on circuit analysis, then 
handclap).

anyone?

thanks for any insight,
greg