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BackHardware for connecting front panel and Pin 1, steel retention lug, horizontal PCB mount, https://www.neutrik.com/en/product/nc3faah2 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) mono jack without switching contact, vertical PCB mount, retention spring, https://www.neutrik.com/en/product/ncj6fa-h-0 neutrik jack combo i Combo I series, 3 pole female receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, horizontal PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch ISO enter 4-bit rotary coded switch, through-hole, https://www.nidec-copal-electronics.com/e/catalog/switch/sh-7000.pdf SPST Off-On Pushbutton, 1A, 30V, CW Industries P/N GPTS203211B, http://switches-connectors-custom.cwind.com/Asset/GPTS203211BR2.pdf SPST button switch | | 8 | 1N4148 | Standard switching diode, DO-35