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BackMake power connection traces larger; 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 | | | | | | | | R17, R19 | 3 | 4.7k | Resistor | | | | U1 | 1 nF | Unpolarized capacitor | | Tayda | A-1157 or A-2425 | | S1 | 1 | SW_3PDT_x3 | Switch, triple pole double throw, separate symbols"/>