The write-up in the App store is pretty vague. It does work with Audiobus as a source as well as Jack, but strangely it doesn't appear to support MIDI routing in Jack...or I just haven't figured it out yet which is entirely possible. I quickly got it controlling Animoog - what fun!
Did run into a strange bug...I was using the MIDI Studio keyboard to send midi to Thesys and sometimes it seemed to reset Thesys...no note data or audio. This required a restart of Thesys. The control channel for Midi Studio was channel 12... not sure if that had anything to do with it.
I've been using this on PC for a while and I'm quite happy to see it on iPad now..