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.
Is it just me, or does anyone else love Ampify Groovebox Synths. I wish they were Audio Units. Poly 8, Retrobass, Minimon and Horizon are just stunning to me. The sounds I get from them are infinite. Honestly if they were Audio Units, they could have probably prevented me from buying 75% of the ios synths I've purchased