The document describes how the author used audio effects tools to manipulate recordings. Specifically, the author used the ReaVocode and Voxengo Boogex effects to make a voice recording deeper and darker. Adjusting the controls on these effects deepened the voice further without distorting the clarity. A second effect was then added that made the audio sound mysterious by introducing echo and fuzz, similar to a degraded radio transmission, and could be suitable for military or sci-fi movies.