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Maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF Kassutronic's KS-20 VCA MK's VCA Probably a straightforward build: one op-amp, four transistors and some example modules main 5a4e89eea6 Add position for resistor between coarse and +12V, value unknown 5a4e89eea63bf71c8fd68e1168f096dfb3459aa4 More cleanup More cleanup Schematics/Fireball.kicad_sch | 4790 Schematics/Fireball_VCO.pdf | Bin 0 -> 163520 bytes Images/IMG_6777.JPG | Bin 138868 -> 139972 bytes Docs/precadsr_bom.md | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS *(optional.

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