We have created a user template for Touch OSC on the iPad for use with our Universal Articulation Control Channel (UACC) pictured below and available from the link at the bottom of this article.
To use this you will need to download TouchOSC from the app store, load the template and also install the MIDI bridge software on your computer.
Once you have loaded up the template, don't forget to lock to UACC for the instrument you are controlling as explained in this article.