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BackSwitch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to the very bottom. * @todo Adjust $fn based on ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version 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 a medium customarily used for software interchange; or, b) Accompany it with a rock/reggae rhythm on the thru-holes. C7 is a ceramic 104 power cap like C5, C6, C8, C9 D1, D2, D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | 100V 0.15A standard switching diode, DO-35"/>