Accented note (right/left hand suggested) r/l: quieter note * : trill, generally three very fast notes on repique/caixa, two or three for surdos Add schematic, start on PCB sandwich, making some final-ish decisions about connecting to front panel and Pin 1, vertical PCB Cherry MX keyswitch, 1.25u, PCB mount, https://www.neutrik.com/en/product/nc3fav2 A Series, 3 pole female XLR receptacle, grounding: separate ground contact to mating connector shell and front panel, vertical PCB mount, http://cherryamericas.com/wp-content/uploads/2014/12/mx_cat.pdf Cherry MX keyswitch, ISO Enter, PCB mount, https://www.neutrik.com/en/product/nl4md-v speakON Chassis Connectors, 4 pole chassis connector, grey D-size flange, countersunk thru holes, vertical PCB mount, asymmetric push, https://www.neutrik.com/en/product/nc3fav1-da A Series.