Understanding how the ghost box functions, especially with regard to the sweep, audio fragments and white noise.
Most of the ghost box models created or tested are altered to sweep either the FM or AM radio band - many offer the option to use one band or the other. As the channels are swept through, either upward or downward, a mix of white noise and audio fragments can be audibly heard. These audio fragments may best be described as bits and pieces of disc jockey voices, music, or whatever is being broadcasted across the band at the time the radio sweep is made. The sound a ghost box produces is similar to using the tuner knob on a vintage car radio to quickly pass over the stations, by hand.
As with all new ideas, I often place a 50-50 figure on something new until I can vote it up or vote it down. Elsewhere on this web site I state I am not a convert of the Ghost Box theory. Most of this is due to what I was told when I asked questions about it and how it worked. Being told a simple answer like 'it talks to ghosts' is not a good way to persuade my opinion.
At a recent investigation I worked with a guy who used both the stand alone unit as well as the software based system. What I did do as part of my own EVP recordings, I also recorded the sounds of these devices. I normally keep well clear of this sort of device due to the racket they make and they can and will destroy EVP recordings, but on this investigation I had little option but to be close to it.
Listening back to the recordings later I became more interested, the reason I have spent some time researching, as well as spending £24.55 on the Echovox system. The Echovox software appears to be the higher rated of the apps that are available.