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Full dev board (in some cases) Arduino + DAC https://www.youtube.com/watch?v=t3kUPjdiq0o for explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on either internal or external clock signal, start/stop, manual step (sw13) // 1 for cv glide atten (rv15 // 13 SPDT switches 1 rotary switch, 5+ positions 6 sockets Potentiometers: One potentiometer for internal clock rate. Switches: Momentary-normal-off pushbutton to manually reset. LEDs: One per step, to set number.

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