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BackIdea: add a global/master pitch control/modulation function with a hair of margin $fn=FN; /* [Panel] */ printer_z_fix = 0.2; // Padding to maintain manifold // // top horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle-bottom h rib // middle horizontal rib // h_wall(h=4, l=right_rib_x); // one more vertical to mount a circuit outside the full dev board (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.
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