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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, needing only one cross-board wire is needed, vs 3 if the PCB is used. - LEDs go in long leg down.

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