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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 ~$8 in parts, two tl074 op amps and otherwise a bunch of wires backwards From 16055f0ae510d4466f2b156df715b3e97e4555d8 Mon Sep 17 00:00:00 2001 Subject: [PATCH] adds front panel design and includes 2.5mm centerward shift for input and output jacks adds front panel and Pin 1, steel retention lug, vertical PCB mount, https://www.neutrik.com/en/product/nc3fbh2 B Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel: mini toggle: 2.5mm above panel, tight but possible mini toggle: ample space above 11.75mm (existing 1p12t rotaries, use 11.25mm holes to PCB edge 15.979999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 25-pin D-Sub connector horizontal angled 90deg THT female pitch 2.77x2.84mm mounting holes to PCB edge 9.12mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 26-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, male, pitch 2.77x2.84mm, pin-PCB-offset 7.699999999999999mm, distance of mounting holes to PCB edge 10.889999999999999mm, see https://disti-assets.s3.amazonaws.com/tonar/files/datasheets/16730.pdf 15-pin D-Sub.

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