iPad Air and M-Audio Keystudio 49i

[swapeman]

I've tried a number of sites to find the answer to this, but am still confused!
Does anyone know if it is possible to use the M-Audio Keystudio 49i to operate the piano keys in GarageBand please?
The Keystudio is self-powered and I'm also using a powered USB hub to connect the keyboard's USB output to the iPad lightning connector. Nothing I do has worked so far. Is there any point in my buying a MIDI/USB hub or is this a compatibility problem?
Many thanks...