eric_peterson
I think you really have to re-think a GUI if you want it highly usable with touch interfaces. I have a 24" touch screen Sony VAIO that I used to drive the Presonus 16.4.2 in our PA. Trying to use the Presonus SW using the touch interface is an exercise in frustration, some widgets aren't even usable. In sharp contrast, when we all take out our iPads and connect to it the touch interface works like a dream.
I had the same experience when I had the 1818VSL, which has a similar interface to the Live mixer systems. What is sad is that the iPad was a waste because I found out I still had to have the 1818VSL connected to my computer and then have that computer connected to a router, and then use the iPad on top.
I was trying to get a system that was ultra portable and I could setup for a live gig and run out of the VSL as a submix to the front of house. Would have been awesome if I could just taken the VSL and an iPad and be done with it.
My next route was to try using my wife's Surface Pro. Would have been great but for two things, the first is exactly what you're talking about, the interface for the desktop app sucked for touch, and wouldn't even format to the screen correctly on a 10" display. The second problem was I found out that the VSL stuff is incompatible with Intel USB 3.0 ports, which is the reason I sold it.
I'm really sad to have given that up because there's really not another interface that works as well for both live sound and recording, that also has integrated Midi ports. I was looking at the MOTU, which is an awesome interface, but alas no integrated MIDI I/O.
Having said all that, I use touch screen in Sonar mainly to navigate the project. Oh my gosh it's so much faster than trying to use the mouse wheel with CTRL and Shift. You can literally fly across the project page using swipe, and it's invaluable in the PRV.