Voltage control

gstopp at fibermux.com gstopp at fibermux.com
Fri Jan 3 19:12:32 CET 1997

     Hiya JDM,
     "Semi-modular" means that the Minimoog signal path is intact, but CV 
     inputs were tapped in everywhere and brought out to a patch panel 
     along with some other simple additional circuits like LFO's and such. 
     There's also a home-brew programmer that modifies all VC settings. 
     Non-VC things like mixer volumes, switches, glide, etc. are not 
     For voltage control of EG attack (times 2), EG decay (times 2), and 
     VCF resonance, I used Vac-Teks (sp?). For the EG depth on the VCF 
     ("CONTOUR"), I used a 3080-based VCA on a tiny piece of vectorboard. 
     Everything else just uses voltage summers.
     As for how I manage it all - I was a single guy in a rented house 
     with synthesizers everywhere up until the 1994 earthquake (the house 
     was at ground zero!). After it all got destroyed I got freaked out 
     and stopped doing that and got married and turned into a "normal" 
     person. Now I just sneak experiments here at work in the lab during 
     lunch or whenever and play with babies in the evening. Fortunately I 
     sit at the computer a lot at my job.
     - Gene
______________________________ Reply Separator _________________________________
Subject: Re: Voltage control
Author:  JDMcEachin <jdm at synthcom.com> at ccrelayout 
Date:    12/25/96 2:24 PM
>     The LED/photoresistor idea is a good one. Using this method you can 
>     retrofit voltage controlled time constants onto the existing EG's in 
>     your commercial gear. A while back I built a programmable semi-modular 
>     around a Minimoog head, and at first I used LED/photoresistor doodads 
>     on the EG's. 
Woah!  This gives me wood!  Just curious, Gene, were the EGs the only place 
you had to use Vactecs?  Did you voltage control everything else by tapping 
into the circuitry w/ your CVs at the right points?  When you say 
semi-modular, does this mean that there are parameters you don't CV, or does 
it mean you stick w/ the default signal path, or what?
One final question - how do you find the time to build all these great 
projects AND write all these great, long emails?  :)

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