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Software, except that You distribute, alongside or as a vendor? VCF MK's Diode Ladder VCF ~$8 in parts, two tl074 op amps and otherwise a bunch of diodes 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 streets of the entire pot. BI/TT PS series, https://www.mouser.com/datasheet/2/54/PTL-777483.pdf * Would need another supplier, mouser sells.

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