The Tonal Pitch Class (tpc) is used to differentiate among notes with the same MIDI pitch but with different representation (also covering enharmony). The tpc is used by the following properties:

Tonal Pitch Classes in numeric order

tpc	name	tpc	name	tpc	name	tpc	name	tpc	name
-1	F♭♭	6	F♭	13	F	20	F♯	27	F♯♯
0	C♭♭	7	C♭	14	C	21	C♯	28	C♯♯
1	G♭♭	8	G♭	15	G	22	G♯	29	G♯♯
2	D♭♭	9	D♭	16	D	23	D♯	30	D♯♯
3	A♭♭	10	A♭	17	A	24	A♯	31	A♯♯
4	E♭♭	11	E♭	18	E	25	E♯	32	E♯♯
5	B♭♭	12	B♭	19	B	26	B♯	33	B♯♯

Tonal Pitch Classes in pitch order

pitch	tpc	name	tpc	name	tpc	name
11	31	A♯♯	19	B	7	C♭
10	24	A♯	12	B♭	0	C♭♭
9	29	G♯♯	17	A	5	B♭♭
8	22	G♯			10	A♭
7	27	F♯♯	15	G	3	A♭♭
6	32	E♯♯	20	F♯	8	G♭
5	25	E♯	13	F	1	G♭♭
4	30	D♯♯	18	E	6	F♭
3	23	D♯	11	E♭	-1	F♭♭
2	28	C♯♯	16	D	4	E♭♭
1	33	B♯♯	21	C♯	9	D♭
0	26	B♯	14	C	2	D♭♭