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.
iOS 7 and metronome
My iPad 2 is running iOS7 and I'm not getting a metronome countoff or hearing any tracks from my output app when I record. For example: Soundprism Pro as an input in AudioBus with FL Studio Mobile HD (or GarageBand) as an output. I have a drum track and a bass line in the output app. When I click the AudioBus arrow to go to SoundPrism (or any other input app) and tap record, there is no metronome countoff, and I can't hear any of my output app tracks. as you can imagine, It's hard to record this way. Is this a bug?