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.
Symphonix Evolution and Audiobus on iOS 7
Guys, I thought I'd drop a quick note to tell you that we're aware of a problem when our app Symphonix Evolution is started on iOS 7. You'll see a message that Audiobus hasn't initialized and you will be unable to connect to Audiobus even though the rest of our app works. Right now we recommend staying on iOS 6 if you use our app in your workflow.
The good news is that we've resolved the problem in our next update. Version 2.1 has been optimized for iOS 7 (it also continues to work on iOS 6) and we're planning to release it within the next week.
Regards, Don Fletcher, CEO Vinclaro Pty Ltd