public int[] parseHelper() {
		if (chord!=null) {
			int add = chord.getBase();
			if (add == -1) return null;
			if (add >= 6) add-=12;
			if (currentType == 0 || currentType == 4 || currentType == 6 || currentType == 7) return new int[]{add, 0};
			else return new int[]{add, 1};
		} return null;
	}