Add note that C12 is optional; not needed if using real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of A4 Updates from real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of latch, https://www.neutrik.com/en/product/nc3fav1-0 A Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, with chrome ferrule and straight PCB pins, https://www.neutrik.com/en/product/nmj4hfd2 M Series, 6.35mm (1/4in) jack receptacle, vertical pcb mount, replaces NL8MD-V, https://www.neutrik.com/en/product/nl8mdxx-v 4 contacts, 3.5mm audio plug, https://www.cuidevices.com/product/resource/pdf/sp-3541.pdf DC Barrel Jack, https://cdn-shop.adafruit.com/datasheets/21mmdcjackDatasheet.pdf Barrel jack connector (5.5 mm.