Dredging up this ancient thread, since I noticed Jon Bernhardt playing "backwards" like this and it intrigued me.
"Then why aren't all string musicians playing with their RH playing pitch?"
Thinking back to when I played violin: the bow requires a lot of precision and finesse, probably more so than the left hand. A Russian virtuoso (whose name escapes me at the moment) once told my youth orchestra that you spend 10 years learning how to hold the violin, then the next 10 years mastering the left hand, then the next 10 years mastering the right hand, and then you finally learn how they all work together. (Not particularly encouraging words for kids!)
I tried turning my Etherwave around with pitch on the left hand, but it was a lost cause :)