Some of the Surface-like tablets ought to be able to run a simple song(s) in SOnar.
If you are looking for android tablet there are several programs that people have used them as controllers. TouchDaw is probably the most used, but there are others. Do a search. It also runs on an iPad. Viewsonic has a 23 inch android touch screen that might be a bit much, but you could probably have your entire interface up.
There are also hardware controllers - I think prosonus still makes their single fader controller w/ buttons.
Of course, you never know what will work w/ your system until you try it. An android tab at this point would probably be the best solution, but no doubt Windows 8 RT will be in the game as soon as developers ... develop one.
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