Below is the classification for EVP that paranormal investigators and EVP researchers use when listening to any potential voice phenomena that they have may found.
CLASS A
A clear and distinct voice or sound that is universally accepted and undisputed, because it must be understood by anyone with normal hearing and without being told or prompted to what is being said or heard. It can be heard without the use of headphones.
CLASS B
A voice or sound that is distinct and fairly loud. This class of voice is more common and can be heard by most people after being told what to listen for. It is usually audible to experienced persons who have learned the skill of listening to EVP. It can sometimes be heard without the use of headphones.
CLASS C
A faint and whispery voice or sound that can barely be heard and is sometimes indecipherable and unintelligible. It may have paranormal characteristics, such as a mechanical sound. Most investigators would apply objectivity and disregard it, but may save it for reference purposes.
Standards And Protocols.
When doing EVP there are some rules to follow to get better results.
Ask the spirits of the dead for permission to take their photos or to record their voices.
Respect posted property, ask permission, and do not trespass.
Always conduct your investigations in a professional manner.
Show reverence and respect in cemeteries, battlefields, historic sites, etc.
No running or horse play in cemeteries or historical sites.
Positive Mental Attitude is very important for all investigations
Skeptical minds will generate negative energy during an investigation. Do not bring along skeptics or those who are negative or want proof that ghosts exist.
Follow the lunar cycles and solar storms for conducting investigations for best results. Paranormal events occur during peak geomagnetic field conditions.
Always use fresh audio tapes for tape recordings.
If digital, record in one or two minute tracks.
After twenty minutes, the spirits will get bored, no need to record longer in one area.
Do not rub the side of the recorder while recording nor walk while recording. Stand still to record.
We do not consider Ouija boards, dowsing rods, pendants or séances valid investigation tools.
No smoking, drugs or drinking during an investigation.
If someone is angry, they should not be involved with an investigation. They will draw angry spirits and the other spirits will avoid them