Line 6 have updated their Mobile POD app to work with Audiobus. Here’s what they say:
Record into GarageBand and Other Apps: Mobile POD is now seen as an Audiobus input, so you can record your Mobile POD tones directly into GarageBand and other CoreAudio recording apps (for a small fee, visit audiob.us for details).
Background Audio: When Background Audio is on, you can dial in a sound, then close the app and continue to hear the processed audio while using another app. For example, you can play a song while looking at lyrics or tab in a web browser or other document viewer.
iPhone 5 Optimization: Enjoy optimized graphics on the 4” display on the iPhone 5 and iPod touch (5th generation).