Wow your app looks amazing. Brilliant.
Also, I've found that the iRig mic makes awesome iPhone recordings.
Here's the mic:
http://www.ikmultimedia.com/irigmic/features/
Here's a drum solo I recorded with the iRig mic (disregard all the other mics that are setup around my kit -- they're not on.)
http://www.youtube.com/watch?v=zJoS0n0-AfU
It sounds okay-ish. Good enough for some collaboration I suppose. Good point!