[dastX]

He wants annotations made in the snippet to show up in the song "snipped" from and vice versa (after the creation).

Yes. :⁠-⁠)

Problem is (like mentioned in the other thread) that for professional classical musicians in some occasions it's not practicable with the "songs" because for rehearsing you need all the parts in one file but in the concert you only need your own part.