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.
Any apps for long distance jamming/collaborations in real time?
The only thing I've found so far that seems legit is Ninjam for pc. Haven't tried it yet, as I was really hoping that something might exist on iOS.
I know latency is the big hurdle here, but a lot of what we'll be working on is ambient, so latency won't be a huge issue.