In the current Voice context, you should add:
\property Staff.NoteCollision \override #'merge-differently-headed = ##t
Actually, you should replace the ##t by ##f.
||||Here is the documentation from the internals about the merge-differently-headed property:
||merge-differently-headed| (boolean):| Merge noteheads in collisions, even if they have different note heads. The smaller of the two heads will be rendered invisible. This used polyphonic guitar notation. The value of this setting is used by note-collision-interface <http://lilypond.org/stable/Documentation/user/out-www/lilypond-internals/note-collision-interface.html#note-collision-interface> . Default value: (unset)
You're welcome
Thanks in advance for your help.
Michael
Olivier Cloirec
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