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BackSend to 16-pin cable when nothing is plugged in on the same size as traces - .3mm for non-power lines, .6mm if carrying power - MK uses a CA3080 OTA, an expensive and rare chip these days ($3/ea on amazon, maybe fakes) 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 to 1amp