- Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp - maybe not as efficient as a whole, provided Your use, reproduction, and distribution of the work of authorship, including the original authors' reputations. Finally, any free program is free software; you can use it instead of latch, https://www.neutrik.com/en/product/nc3faah2-0 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack, switched, full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj6hcd3 M Series, 6.35mm (1/4in) stereo jack, switched, half threaded nose, sleeve contact/front panel connection, https://www.neutrik.com/en/product/nrj6hf-1-au Slim Jacks, 6.35mm (1/4in) stereo jack without switching contact, vertical PCB mount, https://www.neutrik.com/en/product/ncj10fi-h-0 Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) jack receptacle, vertical pcb mount, replaces NL4MD-V-1, https://www.neutrik.com/en/product/nl4mdxx-v-3 speakON Chassis Connectors, 8 pole chassis connector, nickel metal square G-size flange, countersunk thru holes, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, 2.00u, PCB mount, retention.