When combining tablets and music workstations are in question, the TouchOSC app is probably the most handy app I have tried. This does not mean that it was especially handy though.
In fact getting TouchOSC to work in a DAW does require quite a lot of effort, after which there are still steps to be taken with controlling different VSTs.
My point is that tablets are meant to make thing more flexible and in general easier when it comes to workflow. Somehow the software industry has missed this when developing inter-app solutions as well as workstation integration. The tools are basically there, but they are not applied effectively and creatively.
I first tried TouchOSC maybe a year ago. Today nothing much has happened regarding to its further development. It could be the standard of workstation integration, but now it is still mostly a solution for enthusiasts who prefer building their own templates.
Missing Sample 