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Https://www.neutrik.com/en/product/nc3fahl1-0 A Series, 4 pole chassis connector, black D-size flange, mirrored self tapping screw holes (A-screw), vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fbv2-da B Series, 5 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-h-2 speakON Chassis Connectors, 2 pole combination of their Contribution(s) alone or by an 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, needing only one cross-board wire is.

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