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.
Auria not so pro
Anyone else find editing midi in Auria pro to be a total abomination? Sick to death with it, notes changing length and position, can't paste or duplicate a region without it moving the notes around etc. What's the point in them having the nice fab filter synths if you can't even program a few notes without it going to shit? Raaaaaaaa!