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.
BPM control in Audiobus for Link would be sweet
being able to easily halve or double the bpm without the use of a slider would be awesome for Link jams. Right now all the Link apps I have seem to have sliders which is a bit messy for me when wanting specific tempo changes. Even if it doesn't change instantly it would be nice simply for keeping things 'on the grid' while recording to be able to just tap a 1/2 or x2 button.