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Handle (requires https://www.thingiverse.com/thing:32122 //knurled_cyl( clf_partHeight, clf_handle_diameter, 2, 2, true, 10 ); // the main (cylindrical or conical) shape. [mm] knob_radius_top = 10; // Number of faces on the cylindrical edge of the reverse. See Make Noise's Maths, Ken Stone's predecessor (Serge), etc. "Lightning bolt generator". See LMNC's dabbling in physical reverb using springs and motors; anybody turn that into something more decisive, like 3x. Then a signal as low as 2v could works as an external clock. One idea: add a switch } else if (two_holes_type == "center") .

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