Audiobus: Your virtual music studio.
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.
Garage Band strikes again :)
Here's my latest. Done with Garage Band. I've imported from iTunes "The Messenger" by A New Funky Generation and built on top of it. Afterwards I deleted the sample and all you hear is GB instruments and loops. I really wish they make it more powerful when they launch iOS8.
With all the fuss about music making on their latest video, I'm sure they'll give it more attention.