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.
[Solved] Arturia Keystep - can I assign the knobs as MIDI controls?
I have a Keystep 37 that I'm using with AUM. Is it possible to assign the knobs as MIDI controls to adjust parameters such as volume? I've tried going into AUM and learning the knob but it doesn't seem to see any MIDI values changing when I turn the knobs.