11 Keyboards chromatic
16/15
6/5
45/32
8/5
16/9
2/1
15/8
5/3
3/2
4/3
5/4
9/8
1/1
C
♯
D
♭
D
♯
E
♭
F
♯
G
♭
G
♯
A
♭
A
♯
B
♭
C
B
A
G
F
E
D
C