Any organic motion detector is just a series of mechanical, chemical and electrical connections which translate the motion to nerve impulses. All these things can work backwards, although likely with much less efficiency. It's a reasonable theory that there's a path creating these sounds from tinnitus even if the original source is the brain nerve signals. Of course there's of other conflicting theories too. But it's hard to experiment to figure it out as we can't cut apart a functioning system to see what parts are doing what - well we probably could, but the ethics board might have a problem with that.