Actually paraliminals are not hypnosis tapes they are opposite to what most people consider hypnosis. They are not intended to induce trance they are intended to wake you up from the trance hence many of the 'stories' help you to discover find and look for answers. Expanding or taking us out of the narrow trance focus that we often have prior to using a paraliminal that we cannot find a solution, that we cannot discover our geniues potential and that we are stuck with the status quo.
Hypnosis tapes generally provide a method or a solution specific set of actions you are expected to take and if you hear it offen enough you become "programmed" as in the sense of all hypnosis. Paraliminals aim to help you discover your true potential, your way, and what works best for you without alianating yourself from yourself. That's one of the reasons why the effects of paraliminals are so subtle for many they straighten the picture not repaint it.
This is how I explain the difference between hypnosis tapes and paraliminals. I'm sure Paul would explain it somewhat differently.
Alex