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.
The Biggest Audio News from Today's Apple Event: IAA is deprecated in iPadOS & iOS 13!
Apple is deprecating IAA in iOS 13! 😮
"Inter-App audio is deprecated. Use Audio Units for this functionality moving forward."
Looks like non-AUv3 apps are gonna be left behind in the future.
From the iOS 13 release notes just published: