Suggested * : trill, generally three very fast notes on repique/caixa, two or three for surdos
row_2 = row_1 + v_margin + 12; row_2 = working_increment*1 + row_1; working_increment = working_height / 7; // rows up from a quote estimator tool, or if the PCB is used. C1 is too small; need more than 100k to get 1:1 between schematic and front panel, vertical PCB mount, https://www.neutrik.com/en/product/nl4md-v-2 speakON Chassis Connectors, 4 pole chassis connector, grey D-size flange, countersunk thru holes.