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.
Just had a play with Caustic and all I can say it's Awesome!!
Went back and revisited this Universal app Caustic and was blown away with the sounds of the synths! FM Synth, Modular, Subsynth, Vocoder Synth and so much more!
Had six modules looping via Aleph Looper all on my iPhone 5s. Amazing!!!
Now that I understand IOS more it makes a whole lot more sense how it's all working. Caustic is awesome!!!