I'm actually having an issue with IOS 5 and my 2011 4Runner TE...
I'm a bit of an Apple Fanboy and use an iPhone and iPad... However it appears that in both whenever you "Pause" the music it kills the feed to the head unit... There's also no difference between the music volume and output from an application.
So tonight when I saw a bad accident and fired up my Police/Fire scanner I couldn't kill the music and let the application stream like I have in the past. I tested this on a few applications and both devices without being able to make it work. I hope a firmware update for the head unit or IOS 5 will fit it. Loved being able to stream application audio in the past!
-Jared