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.
Free course - Critical Listening for Studio Production
I ran across a mention of this free 7 week course while reading the Reaper forum. It looks interesting especially since I'm just a self taught, marginally talented, amateur living room DAW jockey who has no real idea what I'm doing.
https://www.futurelearn.com/courses/critical-listening-for-studio-production
I haven't started the course yet but this link takes you to the Reaper forum thread that has posts from a couple of people who have started it.