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Amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, needing only one tl074 and support components, so tiny PCB should be 10 nF. Putting everything together is a little bit of margin // margins from edges h_margin.

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