Tonal Pitch Classes
In the plugin developer handbook, I was looking at the table of "Tonal Pitch Classes in pitch order"
http://musescore.org/en/plugin-development/tonal-pitch-class-enum
I was wondering what the bold numbers in the left column meant (numbered from 11 down to 0).
Comments
I understand your puzzlement... It looked SO obvious when I originally draw that table, but coming back to it months after it seems less so.
Anyway, the numbers you refer to are the scale steps, where 0 stands for C (and its enharmonic equivalents, B# and Dbb), 1 for B##/C#/Db and so on. For each step there are 3 possible tpc's (except step 8, which has only two) and I thought useful to have a label under which to group them.
That second table is in itself only a convenience, as the order of the circle of the fifths described by the tonal pitch classes is not always the most useful order.
M.