I am trying to write a scheme to achieve the functionality I was asking about in my earlier message <https://lists.gnu.org/archive/html/lilypond-user/2017-11/msg00147.html>. I think that I could do it with a simple callback function on the NoteHead.transparent property and make the notehead transparent if it is a breve that is preceded by another breve and not the first note in its system.
It's easy enough to determine whether the NoteHead is a breve in scheme, but how do I determine whether it's the first of its system, and how do I reference the NoteHead that comes immediately before it (if any) to determine whether that is also a breve? Thanks! *Benjamin Bloomfield*
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