Add note that C12 is optional; not needed if using real TL0x4, fix pots being backwards, tighten up schematic, fit letter instead of latch, https://www.neutrik.com/en/product/nc3fahr2-0 A Series, 3 pole XLR female receptacle with 6.35mm (1/4in) switching stereo jack without switching contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mbv-1 B Series, 4 pole male XLR receptacle, grounding: ground contact to mating connector shell and front.