Ciao Robert, sorry if I reply so late. What you propose to do is a bit too complicated for me and I'll use it as a last resort. What I'm trying to do now is just to open the midi file with musescore and add a note in the file to correctly shift the others.
Anyway, it would be great having some programming tools to manipulate lilypond source code like what I was asking for. Thank a lot for you help Robert!!! Best regards, Gianmaria
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