AW: Weird Envelopes??? [was RE: CS-80]

[Mike Peake]

>	>And perhaps the most spectacular EG-type design
>	>is/was the Buchla Quad Function Generator. This device used two
>pairs of
>	>EG-like circuits which could be fired in a quadrature
>relationship: A
>	>fires, A reaches sustain then B fires, B reaches sustain then A
>drops, A
>	>goes to zero then B drops. You could hook up the pairs in
>quadrature
>	>relationships, as well, and set up cycling ASR-type envelopes
>off of a
>	>single input trigger, and even take this way up into AF range
>if desired.
>
>Sounds interesting !
>Reminds me of the EMS "Trapezoid", where the "On" and "Off" times
>are (of course) produced by capacitor charge / discharge slopes.
>So in this case you'd just have to bring this internal voltage out, do
>some
>rescaling etc.
>But it's hard to imagine this for ASR-type envelopes - at least for
>their
>common implementation where the sustain phase is just an asymptotic
>tail of the (exponential) decay phase ...
>Of course one could trigger the attack of a second ADS when the peak
>voltage of the first one is reached, but I doubt that this is what you
>tried
>to describe.
>More information about the Buchla Q F G would be great - schematics even
>??

The 281 QFG is a truly great piece of gear. It's damn fast, each segment 
is voltage controlled, and I've been told the segment times can go up to 
20 seconds with an external voltage input. There's a scan of one at 
Synthfool, under Buchlas! or some such. It's a photo of a huge Buchla, 
and has scans of several individual modules. It's mislabled as a 285 QFG.

The company EVOS has envelopes that share some of the better ideas from 
the 281. Check it out.

Easier,

Mike


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