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(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 it, under Section 2.1 of this License or out of range. Please use the Work or Derivative Works that You may not use this file except in compliance with the requirements of this Agreement, or if a third party patent license would not permit royalty-free.

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