[sdiy] Figureing out Buchla timbre waveshaper

[jhaible at debitel.net]

> Any hints?

The opamps run into saturation at different levels.
A weighted summing of their outputs gives the desired
"fold back" transfer function.
I think these opamps have MOSFET output stages, which
allows for rather defined saturation - but check the
data sheet. (I haven't.)

JH.

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