Sibelius 5.1 works very well with our Special Edition. The Sibelius guys already made a soundset which gets shipped with Sibelius 5.1.
By using the Vienna Ensemble, working with Sibelius is much more comfortable than by just using multiple instances of the Vienna Instruments. So I would recommend downloading and installing it.
However there is one tweak to the soundset one has to make before using it with the Vienna Ensemble, as it was designed for use with Vienna Instruments without Vienna Ensemble. Using either the Sound Set Editor by Sibelius or a text editor, change the Nubmer of MIDI channels (NumLanes) to 16 instead of 1.
If your USB MIDI drivers are installed correctly, there should be no problem with our software.
Andi Olszewski,
Vienna Symphonic Library