> I guess my question then is whether there's a way to export it to
> another notation program - since all of them use a different protocol to
> define quarter tones. I saw that there's a lilypond->musicxml project
> but I am not sure what stage of development it is in.
>
Just use Frescobaldi, enable the "experimental features" on the first
Preference page and try to export your example. If it works - great. If
it produces a crash - please report at
https://github.com/wbsoft/python-ly/issues. If it *does* export but the
export isn't good enough - please report at the same place.