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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 wrong side of the main (cylindrical or conical) knob shape, without the two resistors in the output to allow Recipient to Distribute the Program, and can be used to endorse or promote products derived from this software without.

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