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/nc4fah-0 A Series, 4 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mbv-sw B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, vertical PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbhl-b B Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbhl-b B Series, 5 pole female XLR receptacle, grounding: mating connector shell and front panel, steel retention lug, horizontal PCB mount, replaces NLJ2MD-V, https://www.neutrik.com/en/product/nlj2mdxx-v speakON Chassis Connectors, 4 pole male XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3mah-0 A Series, 5 pole female XLR receptacle, grounding: ground contact to mating connector shell and front panel, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/ncj6fa-h-da Combo A series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc3maah-0 AA Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3fav1 A Series, 4 pole chassis connector, black D-size flange, countersunk thru holes, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3faav1-da AA Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel, lateral left PCB mount, https://www.neutrik.com/en/product/nc3mamh-ph speakON Combo, 2 pole chassis connector, gray D-size flange, self tapping screw holes (A-screw), horizontal PCB mount, https://www.neutrik.com/en/product/ncj9fi-h-0 Combo I series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, https://www.neutrik.com/en/product/nc3maah-1 AA Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc4fav B Series, 3 pole male XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3mbv-1 B Series, 5 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, lateral left PCB mount, retention spring, https://www.neutrik.com/en/product/ncj6fi-h Combo I series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, horizontal PCB mount, black chrome shell, https://www.neutrik.com/en/product/nc3mbh-b B Series, 3 pole male XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, lateral right PCB mount.