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 - Lighting For Storytelling
This one is waaayyy OT, but if anyone is interested in illustration, painting, CG, photography or cinematography then this video might be of interest - it's a video I've just released on YouTube that is based on many years of research and experience (I've worked as an illustrator for many years and also as a lighting lead in film):