Gear:

- When using a digital recorder it is not necessary to use an external microphone. I have found that it actually increases the amount of static recorded.

- When using a cassette recorder, be sure to use an external microphone and place the microphone as far away from the recorder as possible. Internal microphones can't get away from recording the gears working and placing the microphone as far from the recorder as possible helps reduce the gear noise.

- Omni-directional microphone...

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Through my mulling around on the internet in search for a typical investigative procedures, equipment, etc, I managed to find some very interesting skeptic-based information on infrasound and it's relevance to the paranormal.

What is infrasound? 

The more scientific jargon would be low frequency standing waves, or for the rest of the world, audio frequencies below 20Hz. Humans can naturally detect audio frequencies between 20Hz and 20,000Hz, so it is pertaining to sound that you cannot hear....
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