[Vibraphon]

My application is analogous to the one as itsme wrote it. I need the transpose only for spontaneous sessions, where e.g. a singer spontaneously needs a different key for a jazz standard.

I haven't tried the smart-button solution yet. That might be a good alternative, but batch processing has been a big advantage in converting all my MSCZ data.

Regardless, as far as I understand it, the smart-button version also has the problem that the corresponding mscz files are not managed/synchronized by msp as well.

The solution from PDF with annotation to Musescore - transpose and back as PDF with annotations in mobilesheets I think is not feasible. If a note line shifts a bit due to transposing, the annotation is in the wrong position.

I also don't see that I would lose the advantages of msp with my approach. I manage my songs entirely in msp. I can implement spontaneous changes with immediate effect from the msp database with the Musescore coupling. If I want to keep the transposed version, I can simply save it in Musescore, export it as a PDF and add it as a copied version (taking annotations from the original PDF), or add it as a new version to the msp database. But I don't do that while making music, I do it afterwards.