I can't seem to get the right pitch without distorting. Here are two vids to help you out.
http://www.youtube.com/watch?v=aBXUOomynxw
http://www.youtube.com/watch?v=fYF3T2LMZCM
http://www.youtube.com/watch?v=aBXUOomynxw
http://www.youtube.com/watch?v=fYF3T2LMZCM