Basic EVP Recording Technique

By Tom and Lisa Butler
Also see: White Paper on Transcommunication with emphasis on Electronic Voice Phenomena

What is EVP?

Electronic Voice Phenomenon (EVP) are intelligible voices found in recording media that have no known physical explanation. Many of the voices are thought to originate from deceased people. This is the primary reason that people first began experimenting with EVP.

Characteristics of the Voices

The recorded voices may be very quiet and may be difficult to hear and understand. Most EVP experimenters say that they have developed an “ear” for the sounds after learning to distinguish them from background noise. In transform EVP, the voices can often be recognized as male or female, young or old. Messages are seldom longer than two to four words. The words may be spoken very quickly, and there is often a distinctive cadence to the voices. Analysis shows that they are simulations of voice made from whatever sound is supplied, and are often missing voice box frequencies and have oddly arranged formants.

Types of Recording

In controlled conditions recording, it is possible to control ambient noise and supply special forms of background noise. Biofield energy is thought to accumulate in a “special” recording area, which is thought to help make contact. In field recording, it is difficult to control environmental conditions or supply background sound, but in known “haunted” locations, the energy helpful for contact may already be present.

EVP formed in an audio recorder by transforming available background sound is referred to as “transform EVP.” In this, it is sometimes possible to recognize the voice of the speaker. EVP formed by sweeping a radio dial, or with a computer program such as EVPmaker, are referred to as “opportunistic EVP” because sounds for voice formation must be made available on an “as needed” basis. Radio-sweep also known as “ghost boxes” or “spirit boxes,”), and in some applications, EVPmaker, depend on the use of “live” voice. ATransC will not use live voice examples for research because of the problem of undetected false positives. EVPmaker using synthesized voice is preferred for opportunistic EVP.

Environmentally stimulated speech synthesis is a relatively new and promising technique, but it should be noted that all speech synthesis approaches currently being tried do not support speaker recognition.

Recording Procedure

Recording Equipment

Digital voice recorders are recommended for transform EVP. Less expensive models produce more internal noise which is useful for voice formation. High quality units will probably require added background noise. A computer can also be used, but will probably require added noise.


Entities will speak at any time of day or night. In the beginning, however, it is advisable to record at a regular time and place. By doing this, the entities learn when there will be an opportunity for contact and expectation of the upcoming session helps focus attention on the process. Try to find a place that will be quiet and free of interruptions. Background sounds are okay, but it is important to be aware of these so that they can be distinguished from the EVP.

Background Sound Source

Research has shown that for transform EVP, the entities use sounds in the environment to help form the words. Most recording situations have some background sounds, but it may be necessary to add noise with something like a fan or running water. Some people use foreign language radio, crowd babble or audio tapes; however, as more has been learned about EVP, the recommended practice has been to avoid the use of radio static or live voice of any form.


Begin with meditation and a short prayer to ask for only those intending the highest good and an invitation to friends on the other side to participate. It is best to record when personal energy is the highest.


Vocalize your comments during an EVP session. The entities will often come through as soon as the recorder is turned on. These beginning messages may be the loudest, so it is a good idea to turn on the recorder and wait a few seconds before speaking. Questions should be recorded, and a period of time between each comment should be left for the entities to respond–about ten seconds. At the end, ask if the entity has something to say.

It may help to make an “appointment” with the intended entity the day before, during prayer or meditation. Some also provide feedback before the session so that the entities will know what worked in the last experiment. It is not necessary to record in the dark. People often try different devices and energy sources to help the entities communicate. Leaving written questions in the EVP experiment area the day before has worked for some.

Keep recording short. Recordings should be closely examined, at least until it is understood where to find the voices. A best practice for field recording is to use two recorders. As a rule, EVP will only occur on one recorder or sound track, making it possible to avoid mistaking local sounds for EVP (false positives).


In transform EVP, the voice is usually not heard until playback. Experimenters report that the voices tend to become stronger and clearer as the entities gain in experience, but at first the voices may speak in whispers. Voices may not be recorded in every session and it may take several sessions to discover the first voice. Hearing the voices is a learned ability. It might take thirty minutes to examine a three or four minute recording.

Classes of Voices

The following system of classification is based on a Best Practice being developed in the Collective at You are invited to participate in developing the practice. Please use the Contact tool to let us know you are interested.

Two-type classification

A distinction is made between phenomena which are always present and phenomena which are transient features. A face seen in the decomposition pattern of a leaf is more or less always there, as opposed to a face found in moving water or video-loop noise. As a general rule, “always there” phenomena appears to be formed by opportunistically adapting naturally occurring processes to express the message, assuming one is intended. If perceived as phenomena, “always there” features would be considered Type 2.

Features found in ever-changing noise are thought to be formed by

Expected distribution of of class

transforming that noise into the voice or face. While the resulting features are fleeting unless caught in media (photograph or audio recording), they tend to be better formed and more easily identified as anomalous. So for both audible and visible phenomena:

Type 1: Transformed physical media; not always present
Type 2: Always present; often as a persistent artifact

Both Type 1 and Type 2 examples are divided by three classes:

Class A: Evident without explanation
Class B: May require directions
Class C: May be vaguely experienced; mostly obscured by noise

Keeping a Log

Maintaining a record of recording results is very helpful. Include the date, time, seconds into the recording, the message itself and the question asked. Be sure to label and save the audio file so that they can be found at a later time. Experimenters report that they feel weather may affect results, but this has not been well studied.

Digital Voice Recorders

Digital voice recorders are recommended for EVP experiments. Today, all sound tracks—digital or analog—should be listened to in a computer and with a headset. Unlike tape recorders, the built-in microphone is usually satisfactory for EVP. Consider the selection guide for audio recorders here. Audacity is an effective audio management program that can be downloaded at no cost.

Computer Recording

A computer instead of a digital recorder can be used for recording EVP. It should have an audio input jack, speakers, headphone jack and sound player application such as Audacity. Most experimenters use the computer to analyze and store examples. If the recorder does not have a USB interface, it is possible to play the recording into the computer while recording with a recorder program. The Earphone jack of the recorder can be connected to the Microphone or Line 1 jack via a cable. The sound source should be set to the correct jack via the pull-down menu in Audacity. Recording with a sample rate of 11025, mono and 16 bit resolution is sufficient for EVP. Files should be edited as *.wav format, but shared as *.mp3.

Analyzing the Recording for EVP

Always use headphones when listening to the recording in a computer. The earmuff style that completely covers the ear is best, but also good are the soft rubber ear buds that are inserted in the channel of the ear.

Be sure to set up a method of saving your recordings in your computer that will allow you to easily locate examples. A good practice is to save the raw recording session in a dated folder and then also save clips containing the EVP in the same folder. Field recordings are saved under the name of the location and the date. It is helpful to keep a separate folder for your Class A examples for easy retrieval for demonstration to friends. ATransC follows the labeling practice of: (c)lisa_butler2008-what_evp_says.mp3. The (c) symbol indicates the intention to protect rights to the example. If you are making the example available under the Creative Commons license, then use (cc) instead of (c). Using first and last name helps sort many examples in the folder for easy retrieval. The underline and dash symbol with no use of capitals helps assure that computer systems and the Internet accept the name. A 200 kb audio file can be reduced to around 15 Kb when converted from a *.wav file to an *.mps file. This makes it easy for sharing files via the Internet.


18 thoughts on “Basic EVP Recording Technique

  1. It’s a pity you don’t have a donate button! I’d most certainly
    donate to this superb blog! I suppose for now i’ll settle for bookmarking and adding your RSS feed to
    my Google account. I look forward to brand new updates and will talk about this site with my Facebook group.
    Chat soon!

    • Thanks for the good words! We are doing okay now with the eBay and Amazon affiliate program and sales of a book. If you want to help, the best thing would be to read the new book, Your Immortal Self and tell a friend.

      Always happy to answer questions on the Idea Exchange.

  2. Hello Tom, excellent work. If possible I would like to feature some of it in our course that teaches individuals about such phenomena. Very well wrote Tom, and easy for the begginer to understand. If possdible, I’d like to include some of it.

    Look forward to hearing from you.

    Steve Mera
    The scientific establishment of parapsychology.

    • Thanks for the good words Steve.

      As part of our effort to inform the public, we use the Creative Commons license wherever possible ( So, if there is not a copyright (c) symbol on the article, please feel free to use the material with proper attribution.

      It is always a good idea to check with us or the author for articles written by someone other than Tom Butler or Lisa Butler. Please let us know if you need the material in a different format.

  3. Admiring the time and energy you put into your website and detailed information you provide.
    It’s nice to come across a blog every once in a while that isn’t
    the same out of date rehashed information. Excellent read!

    I’ve saved your site and I’m adding your RSS feeds to
    my Google account.

  4. We are a bunch of volunteers and opening
    a new scheme in our community. Your web site provided us with helpful information to work on. You have
    performed a formidable task and our entire neighborhood will likely be grateful to you.

  5. Definitely imagine that which you stated. Your
    favourite reason appeared to be at the net the easiest factor to bear in mind of.
    I say to you, I certainly get irked whilst other people think about issues that
    they plainly don’t realize about. You controlled to
    hit the nail upon the top and outlined out the whole thing
    with no need side effect , other folks could take a signal.
    Will likely be again to get more. Thank you

  6. Great blog here! Additionally your site so much up very
    fast! What host are you the usage of? Can I am getting your associate hyperlink on your host?
    I wish my web site loaded up as quickly as yours lol

  7. I do not even understand how I stopped up right here, but I
    assumed this publish was once good. I do not know who you’re but certainly you are going to a famous blogger for those who aren’t already.


  8. After looking at a few of the blog posts on your web site,
    I seriously like your technique of blogging.

    I added it to my bookmark site list and will be checking back soon. Take a look
    at my website as well and tell me what you think.

    • Thanks! I did try to go to your website but ended up on a beard trimmer site so I pulled the link down. Sorry.

  9. We stumbled over here from a different page and thought I should check things out.
    I like what I see so now i’m following you. Look forward to going over your
    web page yet again.

  10. I drop a comment when I especially enjoy a
    post on a blog or if I have something to add to the
    discussion. Usually it’s caused by the fire displayed
    in the article I browsed. And on this post Basic EVP Recording Technique | ATransC.
    I was actually moved enough to post a thought 😉
    I actually do have 2 questions for you if it’s allright.
    Is it only me or does it seem like a few of these comments come across like written by brain dead individuals?
    😛 And, if you are posting on additional online social sites, I’d like to follow you.

    Would you make a list all of your community sites like your linkedin profile, Facebook page or twitter feed?

    • Each comment contributes in its own way. I really like all of the comments because they teach me a little about who is interested in these subjects. For instance, I find it facinating that the “How to” article has received the majority of comments since we remodeled the website.

      My personal website is at I do use Facebook ( and we maintain a ATransC page at I set up a page to advertise the new book at but I am still not sure I want to advertise.

      Even though it is basically a ghost town, we are maintaining the Idea Exchange discussion board for a while longer to see if people have questions about the new book. It is at

      Otherwise, Lisa and I keep a relatively low profile on the Internet. I do comment here and there as I feel able to contribute.

Leave a Reply