Firstly I apologise for the subject, I don't know how else to describe it. Anyway what I speak of is the slapping technique where when you bounce your thumb off, you bring the opposite side of your hand (opposite to your thumb) back down on the strings. I cant seem to perform this technique too well. A good example of what im talking about is a song by an english band called Sikth who all you american dudes should check out! The song is called "Hold My Finger". Anyways any input would be appreciated on helping me and others perfect this technique. - Josh.