Unlike my Trance Maintenance Binaural, this background binaural uses five different voices, with brown noise modulated to follow the changing binaural beat frequency. This binaural served as the prototype to the background binaural used in many of the files that I've recently posted. Starting in the high alpha range, this file progressively dips down through the theta, then flirts with light delta before sliding back up, ending again in the high theta range. Great for use along with another file, 20-30 minutes in length. Not for use while driving or other tasks requiring vigilance.