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.
Anyone struggling with EQ, Compression or Reverb should watch this video
1/2 an hour but totally worth it.
This video is focused on guitars, but the principles in it work for everything.
It explains using EQ and uses ProQ2 for the demo, it covers attack times for compression and then using delay instead of reverb.....
What I like about this vid is that it explains not only how, but WHY.