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Or quad would add very little cost even without 1v/oct, could be done with a wire. Assembly Notes: Do not connect the Normal pin for op 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, two tl074 op amps and.

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