Hey Tom,
I don't believe there's a music notation program out there yet that is
VoiceOver compatible. Finale, as I understand, is supposedly written in
Coco, but I doubt it's terribly accessible. Having said that, I haven't
tried the most recent version. Now, Sibelius is cross-platform and, the way
the scripting in JAWS works with Sibelius is that it relies on a sort of
info window (I forget what it's officially called) to determine pitch,
duration and attributes, etcetera. It's conceivable that the window might
present enough information to VoiceOver to be useable but I doubt it would
be anywhere near as efficient as Sibelius Speaking is on the Windows side. I
spoke with someone at Coda, the makers of Finale a while ago and they didn't
seem too interested in the whole accessibility issue. Being the predominant
program in music education, you'd think they'd be more receptive but...
Having said that, Sibelius is no stranger to accessibility issues, given the
Dancing Dots solution. Maybe they'd be more receptive to making sure it's
accessible with VoiceOver.
Slau