Yes, I have this. The radio analogy is something I've thought of before because I always have a song going on, too! I don't usually hear more than one "station" at a time, though--it's more like someone flipping through different frequencies, so I hear different voices and conversations and screaming and so forth in the background, behind whatever else I'm thinking about at the moment. I always thought this was normal until I described it to my T one day.