Attack dependant decay/sustain

[Grant Richter]

This is the reason for voltage controlled envelopes.
Say you have a control voltage called "shape".
As the control voltage is increased the various
voltage controlled stages can lengthen or shorten
depending on the polarity of the input.

For example: The shape pot puts out 0-10 volts,
it also has an inverted output that goes 0 to -10 volts.
(just the voltage thru an inverter)
The positive output is routed to attack CV input.
The negative outputs are routed to decay and sustain
CV inputs. Now as shape is advanced, attack lengthens
and decay and sustain decrease.

Buchla, Serge, Aries, Doepfer, Wiard and I think
Blacet (sorry John, haven't looked at the page recently)
All support voltage control of envelope shape.

Modulars that do not support it are Moog 900 and
Arp 2500. But those are such early designs they
don't include a lot of features we would now consider
standard.

----------
> From: Carlos Vila Deutschbein <si04697 at salleURL.edu>
> To: Sinth-diy <synth-diy at mailhost.bpa.nl>
> Subject: Attack dependant decay/sustain
> Date: Thursday, February 03, 2000 2:40 AM
> 
> I just had an idea and I would like to know if sombody else has thought
> about this...
> The idea is to do an attack dependant decay/sustain. Normally, in
acoustic
> instruments, decay happens with fast attacks due to the inertia of the
> interpreter or the instrument itself. But if the interpreter forces a
slow
> attack (imagine a flute or a violin) there is no decay before the sustain
> phase. Based on this, wouldn't it be nice to modulate decay time and or
> sustain level depending on attack time? 
> Has any manufacturer implemented this?
> It would be easy in a digital design but in an analog one?
> Just thoughts... 
> -- 
> ==================================================
> Carlos Vila Deutschbein       si04697 at salleURL.edu
> Enginyeria La Salle     www.salleURL.edu/~si04697/
> -------------- Barcelona, Spain ------------------