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BackPROVIDE this CC0 or use of these should be 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 Envelope/Envelope.kicad_pcb | 2 | 10k | Resistor | | C7, C12, C13 | 1 | TL074 | Quad operational amplifier, DIP-14