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Something else VCF MK's Diode 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 https://www.schmitzbits.de/ms20.html which is a ceramic 104 power cap like C5, C6, C8, C9 D1, D2, D3, D4, D5, D6, D7, D8, D9, D10 | 8 | 1N4148 | Standard switching diode, DO-35 Pin header 2.54 mm.

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