I have a 'function' that redefines commands like \slurUp to color the corresponding grob (highlighting manual interventions during score development).
Is it possible to 'catch' instances of grobs whose direction has been set by the ^ and _ operators and call a music function on the affected object.
I'd like to write
a^(
and as a result get
\once \override Slur #'color = red
a^(
Any ideas?
Thanks
Urs
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