TS) Quad operational amplifier, DIP-14"/> Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | J3 | 1 | SW_3PDT_x3 | Switch, single pole normally-open tactile switch https://www.ckswitches.com/media/1973/ksc7.pdf C&K Switches 1P1T SMD PTS125 Series 12mm Tact Switch with High Contact Reliability, Side-actuated Model, without Ground Terminal, with Boss Ultra-small-sized Tactile Switch for High-Density Packaging Surface Mount (SMT), Audio Jack Connector (https://www.cuidevices.com/product/resource/sj2-359x-smt.pdf Korean Hroparts Elec PJ-320D-4A (https://datasheet.lcsc.com/lcsc/1810121716_Korean-Hroparts-Elec-PJ-320D-4A_C95562.pdf smt female jack horizontal A 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/nc3faah2 AA Series, 3 pole male chassis connector, nickel metal square G-size flange, countersunk thru holes, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fbv2-da B Series, 5 pole female receptacle, grounding: separate ground.