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Ladder VCF Kassutronic's KS-20 https://kassu2000.blogspot.com/2019/07/ks-20-filter.html ** uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the right sub-panel top_row = height / 2 + hole_diameter + hole_margin*2; cutout_width = board_width - (side_margin * 2); hole_horiz = (board_width - hole_hdist) / 2 + (enable_stem ? Stem_height : 0) + knob_height - cone_indents_cutdepth; for (z = [0:cylinder_number_of_indentations.

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