[sdiy] Figureing out Buchla timbre waveshaper

[Aaron Lanterman]

I've made some progress in figuring out the schematics to the Busic Easel, 
particularly how the oscillator works.

But... I'm totally stuck on figuring out the timbre generator, which is 
some sort of waveshaper thingy:

http://www.simple-answer.com/buchla_timbre.jpg

A sinewave goes in and who knows what comes out...

There's a whole bank of op amps - TL082 it seems - doing I'm not sure 
what. Then there's some diodes on the right part of the page...  and a 
dual FET near the imput.... man, I have no idea how to start thinking 
about this circuit.

Any hints?

- Aaron

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