EVP Beginner's Lesson
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EVP Beginner's Lesson

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EVP lesson for beginners.
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In this module I teach people new to Ghost Hunting how to capture and edit clear EVPs, or Electronic Voice Phenomena. Most ghost hunters haven't heard of an audio filter called a multi-band compressor. I know they aren't getting the best results then.

Here are some helpful links. The one for the explanation of MP3s sums it up near the end "Remember that MP3 is lossy compression: most of the audio information has been thrown away to create the MP3s and you can never get it back!"
http://www.explainthatstuff.com/how-m...

I happen to use Final Cut Pro X because it's so easy to work with. But Sony Vegas, Adobe Premiere, Avid, etc are ALL excellent editors. If that's your platform, terrific! Just learn to use the same tools in your preferred editor. Here's are links to great guides on the FCPX audio filters made by Logic Effects:
Dan Brockett's Beginner's Guide - http://www.kenstone.net/fcp_homepage/...
The Complete Apple Manual for Audio Filters by Logic Effects - http://help.apple.com/finalcutpro-log...

Here are my EVP processing steps:
1. Record high quality uncompressed, 24 bit 96khz wav files. Keep recorder away from other electronics. BE CAREFUL on the recording level. Set recording at 70% but watch the meters. Never let it get into the red, over 0db because it will get clipped. All of the information above 0db will be lost forever.
2. Download and synch the audio with the camera audio on the timeline. Always use good headphones.
3. Disable the camera audio as it is usually much noisier
4. Listen all the way through a few times to get the feel for it.
5. You should be able to hear your team's conversations and any unusual knocks, words, etc. Label them with a text box. This is an important step because as you work with audio filters you sometimes have to distort normal conversation to hear the EVP. You don't want to get them confused.
6. Separate the audio from the video. You should have two audio tracks, one for the camera, the other your recorder being careful not to lose synch.
7. Make an exact copy of the synched recorder audio. Reconnect the original camera and recorder audio to the video. Again, this is an important step. If you think you've gotten the second audio out of synch, you can compare it to the original. Now lower the volume completely on the video's 2 audio tracks.
8. Drop a Compressor filter on the new audio file. This is my standard workhorse. The compressor doesn't compress the file to make it smaller, it compresses the sound levels. It raises the quiet parts while keeping the loud parts under the legal limit of 0db - much better than using the Gain setting. There are a lot of settings available to you, but start with these:
- Set Compressor Threshold really low, at -40db.
- Set Ratio at 3:1 - a good start for vocals.
- Select the "Limit" check box and set the threshold to -5db.
- Set the "Knee" to .5
9. In FCPX scroll down on the audio page and set the "Equalization" to "Flat". "Pan" mode is "Stereo" and if you have a mono recording, set the "Channel Configuration" to "Dual Mono".
10. Check the blue triangle pointing right and go to the second page. Set both "Loudness" and "Background Removal" at 30% , and set "uniformity" level to 20%. Many extremely quiet EVPs require the Background Removal to be at 100%
9. Now listen again and make your timeline really large so that the waveforms are clearly visible. I usually work with only 10 seconds of audio at a time. Look for what appears to be static.
10. When you find something, blade it off "B" so that you can loop it and listen to it over and over.
11. It is often useful to slow it down by 50%.
12. In the drop down menu there is an option to "Preserve Pitch". It is usually selected by default. Deselect it and see what you get. Sometimes what sounds like an unintelligible word is actually a growl when you lower the pitch.
Happy Hunting!
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