Audiobus: Use your music apps together.
What is Audiobus? — Audiobus is an award-winning music app for iPhone and iPad which lets you use your other music apps together. Chain effects on your favourite synth, run the output of apps or Audio Units into an app like GarageBand or Loopy, or select a different audio interface output for each app. Route MIDI between apps — drive a synth from a MIDI sequencer, or add an arpeggiator to your MIDI keyboard — or sync with your external MIDI gear. And control your entire setup from a MIDI controller.Download on the App Store
Audiobus is the app that makes the rest of your setup better.
Please allow several audio sources to be mixed
Well, I'm into Audiobus too, but hope this app do this too:
I want to play my piano app (IGrand, bs-16i, Grand Piano) together with unrealBook (sheet music display and mp3 playback). Enable two audio sources together at output.
By the way, Audiobus doesn´t have to "scan" audio apps already stored in the IOS device?