Thank you very much, now I know at least how to get from a grob to the
corresponding music object.
In order to "catch" the notes under a slur that aren't slur attach points
("middle notes") I tried to use a closure as the callback function and
store information on the "slurred state" (in slur / not in slur) in a
variable. Unfortunately the callback isn't executed for the notes in input
order, but in a quasi-random fashion, so this technique isn't usable at
all. It seems that a property callback function isn't a tool suitable for
detecting and modifying all slurred notes.
I hope that sooner or later I will find The Right Tool for the Job (TM).
Jakub
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