Having a tablet or pad or whatever replacing a lap or desktop seems a bit far off. What is nice about the pad is its portability, not its power. Running SONAR or any DAW on it seems kinda silly - cramped screen, lack of keyboard, etc. Too many compromises, tho it should be noted I used to run SONAR on CPUs that didn't match the tablet's specs.
I'm planning on getting a keyboard/cover combo for mine - the onscreen version is OK, but more like a blackberry and I'm back to pecking w/ one finger (about the only useful class I took my snr. year in HS was typing).
As an adjunct to your main rig, tho, I think a tablet/pad style controller is a great solution. So many things that are tedious on the mouse are easy on it. See and touch, scroll. natural. Faders, of course, are better as hardware. I'm use to the tactile feedback. And I've played with some of the soft synths for the IPad and the rotaries are a pretty nice way to do that.
Ideally, your touchpad replaces the mouse next to keyboard. Move around the screen (clone view), click on a button or knob and have a pop up for large scale roarty control. Back, on to next item. Bring up fx or a softsynth for editing. blah blah blah. Even faders are doable, tho having a single motorized fader built-in to your pad would be the penultimate controller. VS 1000?
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