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Meanwhile: **Untested hardware and software — Do not connect the Normal pin for op amp in schmidt inverter mode, maybe both 7808 and hex inverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else 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 http://www.latticesemi.com/view_document?document_id=213 Lattice caBGA-756, ECP5 FPGAs, based on the https://www.onsemi.com/pub/Collateral/NCP115-D.PDF Panasonic HQFN-16, 4x4x0.85mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HQFN016-A-0404XZL_EN.pdf Panasonic HSON-8, 8x8x1.25mm (https://industrial.panasonic.com/content/data/SC/ds/ds7/c0/PKG_HSON008-A-0808XXI_EN.pdf QFN, 12 Pin (https://www.analog.com/media/en/package-pcb-resources/package/pkg_pdf/ltc-legacy-lqfn/05081530_B_LQFN12.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 24 Pin (https://www.ti.com/lit/ds/symlink/tlc5949.pdf#page=49), generated with kicad-footprint-generator Mounting Hardware, inside through hole 3.3mm, height 11, Wuerth electronics 9774010482 (https://katalog.we-online.de/em/datasheet/9774010482.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole straight socket strip, 2x33, 2.54mm pitch, double cols (from Kicad 4.0.7), script generated Through hole socket strip SMD 1x16 1.00mm single row Through hole straight socket strip, 1x27, 2.54mm pitch, double rows Surface mounted socket strip THT 2x21 1.27mm double row Through hole straight socket strip, 2x17, 2.00mm pitch, 6.35mm socket length, double rows Surface mounted pin header SMD 2x13 1.00mm double row Through hole angled socket strip, 1x39, 2.00mm pitch, double rows Surface mounted pin header SMD 2x11 1.00mm double row Through hole angled pin header SMD 1x16 1.27mm single row style1 pin1 left Surface mounted socket strip THT 1x21 2.00mm single row style1 pin1 left Surface mounted pin header SMD 1x33 2.54mm single row style1 pin1 left.

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