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.
Need midi control over tempo
When playing live I often have to make on-the-spot tempo changes. I play music for a dance group, and most of that is during rehearsal. A frequent instruction from the teacher is "ok, let's repeat that, this time a little faster/slower please".
If I'm not playing with a backing loop, no problem. But I like my loops, so I'd love to be able to quickly change playback speed without having to adjust tempo via the iPad's screen. (And some metronome controls are downright annoying, either with hard to control jumps, or slow scrolling.)
So, I'd need a midi control, ideally using a foot pedal. But twisting a knob would work too.
What playback apps would allow me to do this? AUM doesn't seem to have this, and if Launchpad (my current loop playback app) does I have not yet discovered how.