Before you do anything to your recordings, make sure you make a copy of the original files and back them up to ensure that you don't unintentionally and irreparably alter the original.

In order to enhance your audio, you'll need some audio editing software. The most commonly used are Audacity and Adobe Audition, both of which are available for Apple Mac and Windows computers, as well as Goldwave on Windows. Audacity isn't quite as good as Audition, but it is completely free to download and use.

Although these and other applications are great for editing audio, they're not really fit for the purpose of enhancing EVPs to the degree that some investigators push them. In the field of audio recording, there is a commonly used term, "signal to noise ratio." The 'signal' is the audio you want - the voice, the music, or in this case, the EVP. The 'noise' is any...