Only Thomas Edison knew for certain whether he
believed in ghosts and the paranormal or not. But he
was quoted as saying he did believe that if our
personalities do transcend death and continue to
exist in another dimension or sphere of existence,
then it should be possible to construct an instrument
to record the voices of these disincarnate people.
Here is that quote by Mr. Edison
"I don't claim that our personalities pass on to another existence or sphere," he told Scientific American. "I don't claim anything because I don't know anything about the subject. For that matter, no human being knows. But I do claim that it is 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, the 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."This quote was made in the October 1920 issue of Scientific American™.
It is my opinion that our personalities do transcend death, and continue to exist in another realm of reality. And if it is true that our personalities do continue to exist then I believe EVP offers the most compelling evidence for this existence.
Konstantins Raudive (1909–1974) was a Latvian born psychologist who was also an avid researcher of parapsychology. And he also had a great belief in life after death and the continuation of consciousness. He investigated with Hans Bender the subject of EVP, and published a book in 1971 entitled Breakthrough: An Amazing Experiment in Electronic Communication With the Dead He also worked with Friedrich Jürgenson in his attempts to capture EVP. It is said that he taped approximately 100,000 audio tapes claimed to contain EVP snippets. These were all claimed to be done under strict laboratory conditions. Whether this is true to standard scientific criteria I cannot say.
The ghost box was created by Frank Sumption, supposedly with the help of the spirit world. The device is basically a white-noise generator and AM radio designed to scan frequencies and generate snippets of sounds. The theory is that the spirits can electronically manipulate this device and carry on a two way conversation with the living.
Personally I am a believer in EVP and believe that they may be an actual attempt by an entity to communicate with the living. But I do have to say that I am skeptical of the ghost box because it does scan radio frequencies, and because of this, I do believe it is entirely possible that stray radio signals could contaminate the device and cause misinterpretation's of these sounds and lead to auditory pareidolia and misinterpretation's.
Sarah Estep's work has been continued and expanded on by Tom and Lisa Butler of ATransC (Association of trans communications), which is also committed to the continuation of education and public awareness and in my opinion is the premier organization for information on this subject.