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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 streets of the stem. [mm] stem_height = 10; // Center adjust to shift left and right columns toward the center center_adjust = 5; // Height of the knob. [mm] // Length of the stem. ≥30 means "round, using current quality setting". Knob_faces = 7; // Radius.

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