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.
OT: Amazing collection of analog synths
I was not familiar with Junkie XL, but his Youtube channel has some amazing discussions / tutorials on his music production process, including sound tracks for some recent blockbuster movies. His discussion on the creation process for the recent Mad Max installment are really interesting. I downloaded an am enjoying the score as I type, which is amazing.
In this video, he shows his jaw-dropping collection of vintage analog synths.