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.
Kosmonaut - Space Explorer | Finally LIVE!
After a leeeeeengthy review process, I'm happy to say that I have now launched my Kosmonaut into the App Space!
Here's the custom Soundtestroom link if you feel like supporting our dear friend Doug: https://itunes.apple.com/us/app/kosmonaut/id1351237773?=1&mt=8&uo=4&at=1l3voJz
I had to add a standalone IAA/AB3 version to get the app past review. I recommend using AUv3 though as there are no advantages to using standalone and it could use some polish (it's really bare-bones).
Here's an iPhone screenshot - don't worry; Kosmonaut is fully universal