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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 the shaft hole, ACP CA14-VSMD, http://www.acptechnologies.com/wp-content/uploads/2017/10/03-ACP-CA14-CE14.pdf Potentiometer vertical hole ACP CA6-VSMD Potentiometer, vertical, Bourns 3224X, https://www.bourns.com/docs/Product-Datasheets/3224.pdf Potentiometer horizontal Bourns 3296P Potentiometer, vertical, top-adjust, Bourns 3314J, http://www.bourns.com/docs/Product-Datasheets/3314.pdf Potentiometer vertical Bourns 3299W Potentiometer, horizontal, Bourns 3006W, https://www.bourns.com/docs/Product-Datasheets/3006.pdf Potentiometer horizontal Piher PT-6-H Potentiometer, vertical, Bourns 3266W, https://www.bourns.com/docs/Product-Datasheets/3266.pdf Potentiometer vertical Vishay TS53YL Potentiometer, horizontal, Alps RK163 Single, https://tech.alpsalpine.com/prod/e/pdf/potentiometer/rotarypotentiometers/rk16/rk16.pdf Potentiometer horizontal Piher PT-15-H05 Potentiometer, horizontal, Bourns 3266Z, https://www.bourns.com/docs/Product-Datasheets/3266.pdf Potentiometer horizontal Vishay 248BH-249BH Single, http://www.vishay.com/docs/57054/248249.pdf Potentiometer vertical Bourns 3214X Potentiometer, horizontal, Alps RK09L.

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