[KJinx101]

While there are already stickers for writing chord changes out, it would very helpful if the letter names could quickly and easily transpose... not by going to the song meta-data and writing in a new key, but by having them linked to a special sticker that functions as a button. Kind of a master/follower relationship;

One special sticker (which is the 'button' Shows, "Key:C" or "Key:Numerals" or "Key:Eb") tapping that would bring up a small menu with all of the keys. Then other stickers linked to this that display letter name would automatically transpose based on the key.

Yes, this is essentially I real pro without midi, BUT it's strengths would be that one could follow the contour of a melody from a lead sheet pdf and play the changes without having to take extra time rewriting it in different keys OR if they have a chord chart pdf, they can add extra notes to it much more easily. Or make chord chart pdfs with blank sheets and add extra helpful notes to them

[BRX]

I doubt it is easy to implement something like that which essentially is "make some annotations transposable" if I understood you correctly.

Do you know about the chordpro and ABC formats which MS now supports? It would probably way more efficient to use those for your transposing needs.

[tristof]

Mobiles/heet is so nice and packed with functionnalities, I discover new ones all the time even after multiple years of usage.
I discovered ChordPro recently (I was using almost exclusively PDF sheet music so far, with few exceptions of images). And while ChrodPro is great with the ability to transpose, it contains much less information than a full piano (or other instrument) sheet music. So I mostly stick to regular sheet music and, if it does not contain it already, I add the chords on top. But sometimes, when accompanying a singer, I need to transpose last minute. Being able to mix chordPro-style annotations on top of a PDF would be the ultimate solution: you add chords (e.g., [A7m]) on top of the PDF but with an ability to transpose like ChrodPro allows would be awesome.

[Zubersoft]

That is why some users are now utilizing ChordPro files with ABC sections within them. 

Mike

[BRX]

Or ABC Files entirely.