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.
PSA: "Tap to Fix" loop with effect apps: iOS bug, here's the workaround
We've been tussling with an annoying bug present in all Inter-App Audio apps including Audiobus where some effects don't seem to load properly. In Audiobus, this manifests as a "Tap to Fix" loop.
Turns out this is an iOS 11 bug that is triggered by denying the effect app microphone permissions. It can be resolved by opening up the system Settings app, finding the settings for the affected FX apps at the bottom, and switching on mic permissions for each.
We've made the appropriate team at Apple aware of the problem, and it's being investigated.