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Schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on a regular polygon. ≥30 means "round, using current quality setting". Cone_indents_faces = 30; // Height of the knob body.

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