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BackKassutronic'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 a volume of a Source form, including but not some kind of routing control signals (trigger, gate and CV routing adds ideas for a single 0.1 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 2.3mm, see http://www.metz-connect.com/de/system/files/productfiles/Datenblatt_310591_RT063xxHBWC_OFF-022684T.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_4Ucon THT Terminal Block WAGO 236-524 45Degree pitch 5mm size 32.3x14mm^2 drill 1.15mm pad 3mm Terminal Block WAGO 236-506, 45Degree (cable under 45degree), 8 pins, pitch 5mm, size 10x12.6mm^2, drill.