I tried the mp3 from the site and wasn't gettin' anything. So instead I decided to try the googles for hypnosis things. and I found this guy's you tube account and the first one I tried worked way better on my first try.
He's got others like this so check him out. http://www.you tube.com/watch?v=6hF3VQlmU6E
(delete space between you and tube)
There are a couple. Anonymistress is a hypnotic Dom who made one called tickle therapy. There is also another hypnotic Dom that made one called Tickle Inferno.