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.
The Metronome update
This might seem ho hum at first glance but it's actually pretty useful: The Metronome, a free app by Soundbrenner, just released an update with Audiobus support and the latest Link features that allow for start/stop of all connected apps. It also has a setlist style feature that allows you to quickly dial in a tempo for songs in a set and start other apps, either on the current device or other connected devices. Not bad for free...
Comments
This is great news! I bought tonal energy tuner for this purpose but could never get it to sync correctly. Thanks for the heads up!
https://itunes.apple.com/us/app/the-metronome-by-soundbrenner/id1048954353?mt=8