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.
Bubble And Squeak
Many years ago I had a client in the UK. I would travel there frequently. Once she took me to a “typical” British pub and suggested I try something called Bubble And Squeak. Apparently, it’s the sound it makes as it’s cooking. I never heard it actually cooking, but this is what I imagined it sounded like. It was delicious.
Edit - I picked up Playbeat 3 a few months ago and this is my first outing with it. It’s pretty cool if you like that sort of thing.