Audiobus: Your virtual music studio.
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.
Confirmed: iPadOS 13 includes support for USB mouse input + Xbox One- en PlayStation-controllers
I make this a separate subject because there was quite a lot of discussion about it on this list
"Mouse input on the iPad works with USB mice connected to the iPad’s Lightning or USB-C port. This includes Apple’s Magic Trackpad, allowing you to navigate through iPadOS without actually touching the display. It is enabled via the Accessibility menu in the iPadOS Settings app."
Fresh from Mac 9 to 5
Updated with Xbox One- en PlayStation-controllers