Audiobus: Your virtual music studio.
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.
Video demo of Polythemus AU midi app Out Now!!
This app was designed to turn mono synths (including hardware ones) into polyphonic ones, but then the voice allocation can also be 'played'.
Here is my first video demonstrating a multi-timbral iVCS3.
Currently only AUM supports multiple output channels from midi effects, but both apeMatrix & Audiobus have this in development.
The app will be available shortly (when Apple understand that AU has to have a host!).