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.
TB Midi Stuff Update Coming Late 2020
From their FB page today
“ Just to say that TB MIDI Stuff v3, which fix a lot of bugs due to the evolution of iOS and be entirely rethought, is on the way.
This major update will be available in 2020, november. And it will also work on macOS Catalina et Big Sur (Apple Silicon ready !).“