This is a post of mine on another group. John W.
My interest in the subject mentioned below is largely through the possibilities of spirit communication, which ordinarily requires employment of a medium. It would be much more efficient and widespread if some sort of electronic or electromechanical or similar device could be devised to reliably enable anyone to do it without using or being a medium, and to be able to contact desired deceased human spirits without danger of impostors coming through, or without the danger of obsession or possession through an ouija board; see http://en.wikipedia.org/wiki/Electronic_voice_phenomenon , http://atransc.org/
The best attempt to develop such devices looks like the Spiricom device invented around 1980; see http://www.worlditc.org/k_06_spiricom.htm ,
http://www.angelsghosts.com/spiricom , http://http://www.rodiehr.de/o_01_meek_spiri_000_007.htm ,http://evprecording..blogspot.com/2005/09/last-spiricom-recording.html , http://cryskernan.tripod.com/electronic_voice_phenomena.htm .
This appears to be an advance on "electronic voice phenomena" (EVP), in which the voices of deceased spirits appear on tape recordings when the tapes were made to record in quiet areas; see the above Wikipedia reference and http://paranormal.about.com/od/ghostaudiovideo/a/All-About-EVP.htm , http://www.electronic-voice-phenomena.net/ , http://www.electronic-voice-phenomena.net/ , http://www.aaevp.com/index.htm , http://www.evpuk.com/ , http://www.ghostweb.com/evp.html , http://evp-recorder.com/ ,
http://www.trueghosttales.com/evp.php , http://www.spinvestigations.org/EVP_Project.pdf , http://www.forteantimes.com/features/articles/130/electronic_voice_phenomena.html , http://spiritsearchers.homestead.com/evps.html , http://www.philhine..org.uk/writings/rit_evp.html , http://www.ourultimatereality.com/electronic-voice-phenomena-or-evp.html , http://cryskernan.tripod.com/electronic_voice_phenomena.htm , http://www.psychicscience.org/evp.aspx . However, it is difficult or impossible to control which spirits record on the tapes.