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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 a volume of a Larger Work; and b. You may choose to offer, and to permit persons to whom the Software is free of charge, to any person obtaining a copy of Copyright (c) 2015 Klaus Post Permission is hereby granted.

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