HelenOS sources

keyoff_note       610 uspace/lib/trackmod/trackmod.c 	if (cell->period != 0 || (cell->note != 0 && cell->note != keyoff_note)) {
keyoff_note       612 uspace/lib/trackmod/trackmod.c 	} else if (cell->note == keyoff_note && cell->instr == 0) {
HelenOS homepage, sources at GitHub