By compressing paraliminals into mp3 you lose risk losing the stereo quality and spatial sound that went into the development of the tapes. To ensure that mp3 format works the file would have to remain over 60meg for the average paraliminal. Not everyone in the world can afford the bandwith to download and for some connections one parraliminal would take 25 hours.
Listen to mp3 with hearing aids... they sound crappy so I prefer tape or CD myself.
Alex