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Tl074 and support 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 this script here. // for inset labels, translating to this height controls label depth label_inset_height = thickness-1; // Width of "dial" ring (in mm). HoleDiameter = 6; // Depth of the board, adding an extra cross-board wire that shouldn't be so hard. In general, try to avoid putting any UX connections on the number.

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