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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 the Gate In jack and switching ground contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fahr2 A Series, 5 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, retention spring instead of latch, https://www.neutrik.com/en/product/nc3faav2-0 AA Series, 3 pole female XLR receptacle, grounding: mating connector shell to pin1 and front panel, horizontal PCB.

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