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8-note. Expanding out to 8 notes means ~$16-20 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 the dial. Set to zero if you download the repository as a result of switching to pcb-mounted panel components and interconnects between middle and bottom boards. Final work on PCB 398c2b234c Checkpoint after re-centering sliders, before removing redundant LED resistors next to transistors to save on panel wires More traces.

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