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.
Decent cheap iOS-compatible MIDI controllers?
I'm looking at spending $100-200 USD (new) on a decent travel- or small-sized controller to use with my iPad. I can do either bluetooth or USB, and I'm looking for at least 18 key, 4+ knobs, and something that is nicely compatible with iOS synths and DAWs. Having pads, more knobs, modulation wheel, etc., would all be plusses. Any suggestions you can offer would be fantastic.