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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 Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on https://www.analog.com/media/en/technical-documentation/data-sheets/199399fc.pdf TO-92 2-pin variant by Heraeus, drill 0.75mm (see NXP SSOP-TSSOP-VSO-REFLOW.pdf and sot371-1_po.pdf STC SOP, 16 Pin (https://ww1.microchip.com/downloads/en/DeviceDoc/16L_VQFN-WFS_3x3mm_4MX_C04-00508a.pdf), generated with kicad-footprint-generator ipc_gullwing_generator.py HTSSOP, 20 Pin (https://www.ti.com/lit/ds/symlink/tps2663.pdf#page=49), generated with kicad-footprint-generator Harwin Female Vertical Surface Mount (SMT), Audio Jack Connector (https://www.cuidevices.com/product/resource/sj2-359x-smt.pdf Korean Hroparts Elec PJ-320D-4A (https://datasheet.lcsc.com/lcsc/1810121716_Korean-Hroparts-Elec-PJ-320D-4A_C95562.pdf smt female jack horizontal A Series, 3 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, steel retention lug, vertical PCB mount, https://www.neutrik.com/en/product/nc3mbh-0 B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, lateral left PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbh-b B Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, retention spring instead of the knob (in mm). (ShaftLength must be non-zero.) NotchedShaft = 0.

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