Hello Dennis,
Thanks. Yes, I'm getting a great deal of success from Vienna Ensemble (latest version) with Sibelius; works very well - does so much so well.
I don't have VE Pro. But am going to the Master Bus in VE as my Sibelius Playback Device, and Adding the Apple AUMatrixReverb there.
It works extremely well - as a reverb. Several convincing wet and dry environments. Great
Just that, once you've set one, all the panning settings (e.g. violins on the left, cellos on the right) no longer work. You can set them, but Playback in Sibelius fails to reproduce them.
If anyone a) knows a workaround and/or b) can suggest a good, robust and reliable (free!) reverb plugin that works with VE and Sibelius, I'd be grateful. (I've been looking at Ambience, which seems to get good reviews.)