I'm using unrealBook. I has a "master/slave" setup; I make my iPad the master, the others slaves. So the other musicians basically use the iPads as display devices. They don't have to do any tapping/scrolling at all. My iPad controls theirs. And my iPad calls up Registrations too (and I have ~500 of those) so it saves me from having to press some keyboard buttons to get the Tyros ready for almost any song I choose from those in my iPad (if I have a Registration set up for it).

Jim