The voice activated search works with USB which is nice, but my wife reported some issues with it. I haven't had enough time to really test it out yet. But she reported that sometimes it would just automatically switch to and start playing from another music source (other than USB) instead of giving a pop up list you can select from. She said this was annoying and it was her biggest complaint. Anyone else care to comment on this? Is there a way to tell it NOT to switch sources with your search?