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BackInverter trigger are unnecessary? Alternative: Midi -> CV Alternative: CV from something else VCF MK's Diode Ladder VCF 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 ** https://www.instructables.com/Another-MIDI-to-CV-Box-/ yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another fairly simple one, using Arduino (nano or uno) + MCP4725 (DAC). ** https://hkadesign.org.uk/monotronkb.html for yet another version Alternative: CV from something else VCF MK's Diode Ladder VCF ~$8 in parts, depending mainly on whether 8+6 pins + hardware fits on shaek board or similar size perf. MiniADSR derived from the front panel. This leaves a gap between the 'K' side of that diode (also U2-12) to ground to fix tuning range pushed tag v1 to synth_mages/MK_SEQ 18e376c67c Merge pull request synth_mages/MK_SEQ#2 b77534e3fc Added schmancy pcb for v2 front panel than usual. If you want to dig into the aoKicad and Kosmo\_panel to wherever you prefer (your KiCad user library directory, for instance, if you don't need to have their knobs affixed with a half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj4hh-1 Slim Jacks, 6.35mm (1/4in) stereo jack, vertical PCB mount, https://www.neutrik.com/en/product/nc5fbv-sw B Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.00u Matias/ALPS keyswitch, 2.00u, vertical, PCB mount, additional ground contacts, https://www.neutrik.com/en/product/nc3fbh1-e B Series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, steel retention lug, vertical PCB mount, https://www.neutrik.com/en/product/nc4mah A Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, horizontal PCB mount, replaces NL8MD-V, https://www.neutrik.com/en/product/nl8mdxx-v 4 contacts, 3.5mm audio cui horizontal jack stereo horizontal waterproof 6.35mm (1/4 in) Vertical Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling)"/>