Spirits do not manipulate electronic devices. They "feed" off of them. Spirits are fed by energy. It takes a lot of energy to do anything that would get itself seen/heard. When you see "orbs" in pictures. If they are actual orbs, they are not ghosts. All orbs are are balls of energy in it's natural state. It is not the ghost.

As far as Slorsx's story, I don't know what could have happened. Somehow, you may have recorded yourselves and heard the playback which was unsaved. I don't really see any paranormal involvement when you hear your own voices like that. Sounds like some sort of freak electronic malfunction to me. I've never heard of anyone hearing their own voices while alive and it being attributed to the paranormal. Later, QD.