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.
Using MiMix 2.1 as a dual 4 channel personal monitor mixer for live use.
Again, I have devs permission to share this.
I use the Aux Audiobus foldbacks to send Auxes 1 - 4 back to inputs 5 - 8. The first four would be out to the Main stereo house feed (outputs 1&2) while the right four ports would go to interface channels 3&4. The Focusrite 2i4 is particularly well suited to this task, as the headphone jack has a switch to listen to 1&2 or 3&4.