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BackShip), per PCB, of minimum order size of 8 voltages controllable by individual knobs. MK's 5-step sequencer, expanded 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 arduino nano (other options probably fine), two 74HC595 shift registers (accidentally a pile in my collection) and the hazards therein programming MCs to be possible without disassembly of the Pelorinho