Has anyone tried these? I've been using them for awhile now, probably some of the most powerful mind medicine there is, outside of using drugs. Basically they work by playing two frequencies, one in each ear. The brain then interprets the difference and try to maintain that frequency. http://en.wikipedia.org/wiki/Binaural_beats http://www.dr-bob.org/babble/20030812/msgs/251092.html I'm actually using Audacity and a plug in to concoct some of my own.