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.
RE-1 Virtual Tape Machine & Looper - Amazing for Dub
Yes, Yes, A great new App from Kai Aras called the RE-1 Virtual Tape Machine and it's also a Looper, very very Cool Beans
You can get the RE-1 Virtual Tape Echo here at the App Store