How about a soundset for the best arranger keyboard by Yamaha the Tyros 5. I have Sibelius 7.5.1. Tia
That might be beyond the scope of what the Sibelius develop is able to do. Sound Sets are generally for third party sound libraries rather than hardware devices such as a keyboard.
Sibelius does have default support for some of the older keyboard models, though Tyros 5 isn't one of them.
Alan, you may want to check to see if Jonathan Loving has one at http://www.soundsetproject.com/soundsets/yamaha/. And if not, go ahead and ask him if he has one in the works. Since he has them for Tyros 1-4, there's a decent chance it's on his radar (and he would be able to get to it before I could anyway).