DIY bass pedal synth

[Hallgeir Helland]

Hi everyone,

I'm going to realize my dreams of a bass pedal synth with presets.
I'll be using my spare CEM 3374 and 3378 (VCO and VCF/VCA) chips, a
simple env. generator and possibly one TomG's VC LFO (one of them).
The idea is: structurally simple, but programmable.

But - do anyone have suggestions for a simple envelope generator?
A really simple one, maybe the ADS type... could JH's VCHADSR circuit
be modified to a simpler one, for example? (remove the H and the R ;-)

And, what is the best way to make a preset-type synth? I was thinking
along the lines of the Yamaha CS-80: one set of "normal" knobs, and 
three sets of miniature controls (trimpots) under a hatch. And then
somehow switch between the settings.  Do I need to have every paremeter
voltage controllable? Will a CMOS switching system be best, or will it
be easier with many-poled mechanical switches?
How did they do the Taurus?


Thanks a lot,
Hallgeir


PS: My Nebulus is nearly done... only need to get the joystick going.
http://www.netpower.no/~roarh/synth.htm
-- 
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 Hallgeir Helland       hhelland at usa.net      
    Evlogia           http://fly.to/evlogia   
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