This is one of the trickiest techniques to master. It is something you really have to work at because it is such a feel thing. But listening to players, who use this - from Billy Gibbons of ZZ Top to modern day screamers like Zak Wyld, will show you just what is possible. It is a great way to get different notes from the same place without moving your left hand, you just move your right hand harmonic and voila!!!