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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 output jacks bottom_row = v_margin + 12; row_2 = row_1 + vertical_space/7; row_5 = row_4 + vertical_space/7; cv_in_1a = [left_col, row_3, 0]; c_tune = [width_mm/2 - h_margin, top_row, 0]; scale([.38,.38,-.005]) surface("FireballSpellVertSmaller.png", center=true, invert=false); projection(cut = true width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of 2mm // for inset.

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