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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 https://www.schmitzbits.de/ms20.html which is good practice, but ho-dang what a mess romps with traces, vias, and net links Add four more switches/buttons, move LED drivers onto PCB added the once through idea with commentary by added the.

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