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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 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some supporting components. ~$6 in parts, mostly down to PCB edge 4.9399999999999995mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 37-pin D-Sub connector straight vertical THT male pitch 2.77x2.84mm pin-PCB-offset 4.9399999999999995mm mounting-holes-distance 33.3mm mounting-hole-offset 33.3mm 15-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm pin-PCB-offset 9.9mm mounting-holes-distance 63.5mm mounting-hole-offset 63.5mm 37-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.54mm, pin-PCB-offset 9.4mm, see http://docs-europe.electrocomponents.com/webdocs/1585/0900766b81585df2.pdf 15-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 4.9399999999999995mm, distance of mounting holes 63.5mm, distance of mounting holes - these gaps reduce heat conduction during soldering - ground plane 56529bef3a0c7d0b31cfccd6b6ce971fb35b4e9c Updates from real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of latch, https://www.neutrik.com/en/product/nc3fah-0 A Series, 3 pole female XLR receptacle, grounding: mating connector shell and front.

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