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.
Why do human beings like listening to music?
I have my own ideas and I'm sure there is scientific research that sheds some light on it. It's something that intrigues me though. What are your thoughts? Personally I feel I connect with music on a very deep emotional level which may be the same for everyone. E.g. tears for a beautiful vocal performance, tingles from a beautiful guitar sound/solo.