Pots. 's notes on repique/caixa, two or three for surdos
row_2 = row_1 + v_margin + 12; //knob_radius top_row = height / 2 + hole_diameter + hole_margin*2; side_margin = (board_width - hole_hdist) / 2 + hole_diameter + hole_margin*2; side_margin .
alt
click/enter