Once EVPs have been recorded, they must be reviewed through sound-editing software, such as Audacity
(shown here). At this point, ghost hunters amplify, slow down, speed up, and analyze strange sounds to try to pick out speech and other mysterious electronic voice phenomena. Of course, it takes heavy manipulation of a recording—not to mention creativity and wishful thinking—to make fuzzy noises sound like voice communication from the other side.
Image: Courtesy of Audacity