Torch, i bought the app and really like it..
Very very promissing.. did you know you can import cubase .ins files..

The app is incredible for hardware comtroll as core of a setup..
But in its current form misses audio capabillities and virtual midi ports..
In this example, they show how to use midiflow and AUM apps to do this..
Audiobus combines these 2 into a single app, and you can even use midiflow and AUM as well as keystage inside Audiobus.



The midi routing from keystage for hardware is incredible..
It can replace V-console when adding an extra keyboard to Genos or any other arranger
(Altough only yamaha instruments have enough exta voices for this)

You just route the ext keyboard to song parts 1 to 8(when using style only) and you have 8 genos sounds and effects available for your extra key.. or with an external midi interface connected to ipad, route the midi to you mac/pc/vst’s

You can also load lyrics and pdf/score/notes into the app..
Yes, seems like this is a very promissing app..