I've only heard things outside my head on very rare occasion, usually a few notes on a piano, or a voice shouting "hey!" or my name.

I, like Faerie Moon, have "another me". Kind of like an invisible friend. Her name is Christina, and I talk to her constantly. We have very intense conversations, with our own inside jokes and stuff. I think she is just another way of thinking for me-in dialogue instead of monologue. I get really lonely, so it's nice to have her. I don't think she's a hallucination, just a different way of my thoughts expressing themselves.

And then I've had telepathic conversations with inanimate objects and dead people. It's not really hearing a voice-it's more like me sending out a thought into the universe, and having my conversational partner insert their thoughts back into my head. I don't think that that's a hallucination either, but I am aware that it is not normal. It rarely happens unless I am currently having other psychotic symptoms, so I think it's part of the illness.