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.
GEORGIA / BH Guitar Shimmered
The Carmichael classic. Again, a piano track transmogrified into classical guitar with a dose of Shimmer. BeatHawk is superb, IMO. It offers a lot of control over the instruments, ADSR, effects, etc. as opposed to say iSymphonic which offers very little but velocity, reverb and tuning. Both great, but BeatHawk is much more flexible. I also used MicSwap for the first time as an effect... very effective!