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 StoreAudiobus is the app that makes the rest of your setup better.
Attention, Apple!
AppleBot crawls my website several times a day. Maybe, they'll see these issues from the crawler or maybe they'll feel embarrassed for some of their silly design decisions now that the list is in public view as opposed to their private bug tracker
A work-in-progress list (I’ve reported some of these issues already in their Bug Tracker) -
https://www.mobilemusic.us/articles/hardware/310-attention-apple