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/nc4fav-0 A Series, 3 pole female XLR receptacle, switching contacts, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, https://www.neutrik.com/en/product/ncj9fi-v-0 Combo I series, 3 pole female XLR receptacle, grounding: without ground/shell contact, horizontal PCB mount, https://www.neutrik.com/en/product/nc5fbv-sw B Series, 5 pole female XLR receptacle, grounding: separate ground contact to mating connector shell to pin1 and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nc3mbh B Series, 4 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), vertical PCB mount, retention spring, https://www.neutrik.com/en/product/ncj6fi-v Combo I series, 3 pole XLR female receptacle with 6.35mm (1/4in) stereo jack, switched, with full threaded nose and offset PCB pins, https://www.neutrik.com/en/product/nmj4hfd2 M Series, 6.35mm (1/4in) stereo jack (T/TN/R/RN/S/SN), https://www.neutrik.com/en/product/nj6fd-v 6.35mm (1/4 in) Vertical Jack, Non-switching mono jack without switching contact, vertical PCB mount, https://www.neutrik.com/en/product/nc3fahr2 A Series, 5 pole female XLR receptacle, grounding: mating connector shell and front panel, horizontal PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fbv1-da B Series, 3 pole XLR female receptacle with 6.35mm (1/4in) 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/nc3faah1 AA Series, 3 pole XLR female receptacle with 6.35mm (1/4in) jack receptacle, horizontal pcb mount, https://www.neutrik.com/en/product/nlj2md-h speakON Combo, 2 pole chassis connector, black D-size flange, self tapping screw holes (A-screw), vertical PCB mount, https://www.neutrik.com/en/product/nc3mah-0 A Series, 3 pole female XLR receptacle, grounding: without ground/shell contact, lateral left PCB mount, retention spring, https://www.neutrik.com/en/product/ncj6fa-v-0 Combo A series, 3 pole female XLR receptacle, grounding: mating connector shell and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.00u plate Cherry MX keyswitch, 2.00u, vertical, plate mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch 2.00u Matias/ALPS keyswitch, 1.00u, PCB mount, retention spring instead of A4 Add.