Back surdo (L for low, H for high R/L: accented note (right/left hand suggested r/l Quieter, unaccented note * : trill, generally three very fast notes on repique/caixa, two or three for surdos
row_2 = row_1 + vertical_space/7; row_5 = row_4 + vertical_space/7; row_4 = working_increment*3 + out_row_1; //special-case the knob (in mm). (ShaftLength must be non-zero.