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.
Songen: AI-Assisted Music Production, Built With Audiokit.
Seem pretty cool. Hope I'm not double post but a search did not give anything and that surprised me somewhat.
Songen is a new AI-powered app created in Helsinki, Finland by Vibin Oy
EDIT: I totally missed it's F*****G subscription, and pretty hefty at that. I am sorry I promoted that -- but it still seem good. Gready Finn! (joke).