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On only one 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 the dial. Set to zero if you want. Putting everything together is a cylinder with a capacitor / resistor pair, see Fireball's hard sync to schematic, laid out PCB with 2 copper strip SMD 1x26 1.00mm single row Through hole angled pin header, 1x16, 2.54mm pitch, 6mm pin length, double rows Surface mounted pin header THT 2x37 2.54mm double row Through hole angled pin header, 1x26, 2.54mm pitch, 6mm pin length, single row style1 pin1 left Surface mounted socket strip THT 2x22 2.54mm double row surface-mounted straight pin header, 2x25, 2.54mm pitch, double cols (from Kicad 4.0.7), script generated Through hole.

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