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 StoreAudiobus is the app that makes the rest of your setup better.
CMP piano tricks, vibrato and crazy evolving sounds using external midi controller
I just noticed these things on CMP. When you are using external midi controller, mod wheel works as a vibrato on the jazz piano(not on grand, others i dont have). Also if your midi keys have portamento you can make really weird sounds with it, using slow portamento. Also pitch bend wheel works normally.