So far i’ve been borrowing my wife’s ipad to play in amplitube and audio out to audio in on my iPad. I also use my iPhone.
Hard way is too play your backing tracks on another audio device while recording guitar part in amplitube and then audio copy/paste or export audio file and import. A real pain either way.
I long for the day when audiobus is a built in feature to all apps.
Btw, i have several apps and devices from IK Multimedia but I have to say they are behind the times when it comes to playing nice with others (apps and devices).