(third guy using cavemen username) Well. I know it aint physics. I am looking at the physics part of it. I heared something about modulating words into background noises or ultrasound in such manner that the subconscience hears them but conscience doesn't interpret them into words. Claimed to be used for hypnosis. Mythbusters tried it. :) At this point I have my hands on a lot of recording software, microphones and stuff like that at work. DID YOU HEAR anything about such devices? Do you know a method that is proven to work to some degree? I am thinking of what to modulate sound into. Thanks.