No accessible way to view individual parts
No steps, that's the problem :-). OK, well:
1) open or create a score with parts
2) try to access one of the individual part tabs vis keyboard alone
As far as I can tell, you can't. I suppose we could implement specific "next/previous part" commands, but also, would be nice if the ordinary navigation could get you to the score and part tabs. They aren't part of the tab order now I guess but perhaps they should be.
This also touches on the issue of scoreview accessibility in general. Right now we use the accessible name to be the score, value & description to read the info about the selected element. That's fine, but some of the things I might have wanted to try in an effort to support more screen readers involve having accessible name contain the selection info. That would leave the score name change not read on Ctrl+Tab, though, and that's not good. But I think if the score/part tabs were more "first class" objects then they'd probably read on changes. Or at least could be more easily made to read.