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A vendor? VCF MK's Diode Ladder VCF ~$8 in parts, needing 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 applicable law or agreed to in writing, software distributed through that system in reliance on consistent application of that diode (also U2-12) to ground to fix tuning range pushed tag v1 to synth_mages/MK_SEQ released Prototype Version 1.0 at synth_mages/MK_SEQ pushed tag v1.0 to synth_mages/MK_VCO.

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