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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 ~$8 in parts, depending on PCB Added hard sync input. - Portamento (aka slew rate controller aka glide). Knob version fairly simple. CV version maybe possible, but a bitmap generator is.

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