A previous entry focused on sounds produced by the ears as directed by the brain. The Radio Lab program, which itself appears to use binaural recordings (they would neither confirm or deny), featured as a link in this item, further details the phenomena of sounds produced by the brain.
Whether you have auditory hallucinations, stuck tunes, or receive broadcasts from your internal radio station, this is familar conversational fodder. Are these things like the visuals from dreams - does experience deepen the color, intensity, localization, and resulting cues, or something else?
Hope you enjoy the program:
http://audio.wnyc.org/radiolab_podcast/radiolab_podcast042208.mp3