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Fix this and turn it into a corner edge of a simple manual EG ~$7 in parts, two tl074 op amps and otherwise a bunch of diodes and support Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules 811ef45c764021f623b8bb59234df1314fce4e91 12V, -12V and ground needed, probably up.

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