- 2 x switching (normalling) stereo jack B-gauge type (T/TN/R/RN/S/SN), https://www.neutrik.com/en/product/nj6tb-v M Series, 6.35mm (1/4in) stereo jack, horizontal PCB mount, https://www.neutrik.com/en/product/nc4mafh-ph A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, lateral right PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 1.00u, PCB mount, https://www.neutrik.com/en/product/nc3fahr2 A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, steel retention lug, vertical PCB mount, retention spring, https://www.neutrik.com/en/product/ncj9fi-h Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, metal nose with efficient chassis ground connection, T+R+S normalling contact, https://www.neutrik.com/en/product/nrj6hm-1-pre Slim Jacks, 6.35mm (1/4in) stereo jack, horizontal PCB mount, https://www.neutrik.com/en/product/nl4md-h-3.