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.
Device to device wired data transfer found in beta code
(Maybe audio and midi one day?)
The latest iOS 13 developer beta includes code and an image that suggests Apple plans to add a new setup feature that will allow individuals to directly transfer data from their old iPhone to a new one using a wired connection. Currently, iOS users have two options when migrating their data to a new iOS device: they can either pull a backup from their computer or wireless transfer their data using iCloud. The code snippet discovered by 9to5Mac includes the image seen below and a prompt that asks the user to “keep your other iPhone connected to this iPhone and connected to the power until the transfer is complete.” Interestingly, it appears iPhone owners will need an inductive charging mat to take advantage of this feature, as it’s impossible to charge an iPhone using a wired connection when it’s connected to another device.
Read more at MobileSyrup.com: iOS 13 may add wired data transfer for setting up new iPhones