EVP -Edison created device to talk to the dead?

Edison stated that it might be "possible to construct an apparatus which will be so delicate that if there are personalities in another existence or sphere who wish to get in touch with us in this existence or sphere, this apparatus will at least give them a better opportunity to express themselves than the tilting tables and raps and ouija boards and mediums and the other crude methods now purported to be the only means of communication." - read article on EVP [electronic voice phenomena], proponents believe dead communicate through EM spectrum