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Key matrix, work out either MC or dumb resistor array to output correct volts for each stage? * TBD, needs testing; but if LEDs are possible, this should be the same size as traces - .3mm for non-power lines, .6mm if carrying power MK uses a ground plane Updates from real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of latch, https://www.neutrik.com/en/product/nc3fahr1-0 A Series, 5 pole female XLR receptacle, grounding: separate ground contact connected to EP (http://www.aosmd.com/res/packaging_information/DFN5x6_8L_EP1_P.pdf 56-Lead Plastic Quad Flat, No Lead Package (MF) - 3x3x0.9 mm Body [UQFN]; (see Microchip Packaging Specification 00000049BS.pdf SSOP, 32 Pin (https://www.nxp.com/docs/en/package-information/SOT358-1.pdf), generated with kicad-footprint-generator Molex Mini-Universal MATE-N-LOK, old mpn/engineering number: 5569-06A2, example for new part number: AE-6410-15A example for new part number: 26-60-4020, 2 Pins per row (https://www.molex.com/pdm_docs/sd/430450221_sd.pdf), generated with kicad-footprint-generator JST GH series connector, B02B-JWPF-SK-R (http://www.jst-mfg.com/product/pdf/eng/eJWPF1.pdf), generated with kicad-footprint-generator JST VH series connector, S11B-XASK-1N-BN (http://www.jst-mfg.com/product/pdf/eng/eXA1.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 56 Pin (http://www.ti.com/lit/an/scea032/scea032.pdf#page=4), generated with kicad-footprint-generator Hirose series connector, S16B-ZESK-2D (http://www.jst-mfg.com/product/pdf/eng/eZE.pdf), generated with kicad-footprint-generator JST ZE series connector, SM20B-SRSS-TB (http://www.jst-mfg.com/product/pdf/eng/eSH.pdf), generated with kicad-footprint-generator.

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