I can access the value of the first override from inside
`make-fret-diagram` , ok.
The second override does not work and I currently don't know why not.
I can access the value of this override from inside make-fret-diagram as well.
Though, it's the procedure not it's return value.
Cheers,
Harm
David on -devel:
"Callbacks are not supported for subproperties."
https://lists.gnu.org/archive/html/lilypond-devel/2020-08/msg00024.html
And later:
I may change that eventually, but that's basically a
possibility at the bottom of a stack of rather extensive
purportive changes, so don't hold your breath for it.
That explains why, I think.
Best,
Jean
