Wiardgroup

Grant has agreed to assemble and send to me retrofit kits for my 
Envelators to make the modification specified by Christophe.  It is 
quite simple, involving a ganged pot-switch (pull on, push off) with a 
capacitor soldered on the switch.  Two wires are attached to a location 
on the board that is a presently vacant spot for a diode.

(You will have to check with Grant regarding cost).

Gary

I measured the time period of both the Buchla 280 and 284 
modules. In normal operation, the Envelator extends an octave 
above and below both of them.

High end - 280 and 284 = 350 Hz
Envelator = 690 Hz

Low end - 280 and 284 = 20 seconds
Envelator = 45 seconds

Also the Buchla system does not use any negative control 
voltages, only 0 to 15 volts. The 256 CV mixer is clamped to not 
go below 0 volts. I'm not clear how you got a negative voltage on 
that instrument.

But the composer is always right!

So for those who need slower envelopes, I will figure out a 
retrofit for the Envelator module. It will require 4 solder joints, but 
can be done without removing the board.