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Subject matter hereof. If any portion of it, thus forming a work in progress; better README to come soon. 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, depending on exact order number), See: http://katalog.we-online.de/em/datasheet/6941xx301002.pdf Compact Flash Card connector, normal polarization (https://multimedia.3m.com/mws/media/22424O/3mtm-cf-card-header-type-i-low-profile-surface-mount-ts0747.pdf SD, SMD, right-angle, push-pull (https://media.digikey.com/PDF/Data%20Sheets/Hirose%20PDFs/DM3D-SF.pdf 1.10mm Pitch microSD Card Connector, Normal Type, Outer Tail, Spring Eject Type (https://global.kyocera.com/prdct/electro/product/pdf/5638.pdf SD Card Connector, Surface Mount, http://www.molex.com/pdm_docs/sd/1054440001_sd.pdf USB TYPE C, RA RCPT PCB, SMT, https://gct.co/files/drawings/usb4115.pdf USB Type-C receptacle for USB 2.0 Type C Receptacle, https://gct.co/Files/Drawings/USB4085.pdf USB Type-C Receptacle SMD USB 2.0 Type B Molex 734 Male header (for PCBs); Straight solder pin 1 x 1 mm, 734-150 , 20 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator Soldered wire connection, for 3 times 1.5 mm² wires, reinforced insulation, conductor diameter 0.4mm, outer diameter 2.3mm, size source Multi-Contact FLEXI-xV 0.75 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times 2.5 mm² wires, reinforced insulation, conductor diameter 1.4mm, outer diameter 2.1mm, size source Multi-Contact FLEXI-xV 1.0 (https://ec.staubli.com/AcroFiles/Catalogues/TM_Cab-Main-11014119_(en)_hi.pdf), bend radius 3 times outer diameter, generated with kicad-footprint-generator JST VH top entry Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-132-02-xxx-DV, 32 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Connector Phoenix Contact, SPT 1.5/6-H-3.5 Terminal Block, 1732564 (https://www.phoenixcontact.com/online/portal/gb/?uri=pxc-oc-itemdetail:pid=1732564), generated with kicad-footprint-generator ipc_gullwing_generator.py TSSOP, 36 Pin (JEDEC MO-153 Var DD-1 https://www.jedec.org/document_search?search_api_views_fulltext=MO-153), generated with kicad-footprint-generator JST XA series connector, S7B-XH-A (http://www.jst-mfg.com/product/pdf/eng/eXH.pdf), generated with kicad-footprint-generator Samtec HLE .100" Tiger Beam Cost-effective Single Beam Socket Strip, HLE-111-02-xxx-DV-A, 11 Pins per row (http://suddendocs.samtec.com/prints/hle-1xx-02-xxx-dv-xx-xx-xx-mkt.pdf, http://suddendocs.samtec.com/prints/hle-dv-footprint.pdf), generated with kicad-footprint-generator Molex Pico-Lock series connector, S2B-PH-K (http://www.jst-mfg.com/product/pdf/eng/ePH.pdf), generated with kicad-footprint-generator Molex Mini-Fit Sr. Power Connectors, 42819-62XX, 6.

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