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5-note to 8-note. Expanding out to 8 notes means ~$16-20 in parts, needing only one tl074 and support Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the top (mm h_margin = hole_dist_side + thickness; v_margin = hole_dist_top*2; left_rib_x = thickness * 1; right_rib_x = width_mm - hole_dist_side - thickness; // column from edge plus hole radius // mounting holes distance 47.1mm 62-pin D-Sub connector, horizontal/angled (90 deg), THT-mount, female, pitch 2.77x2.84mm, pin-PCB-offset 14.56mm, distance of mounting holes 25mm, see.

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