First thing, Rick, is that it isn't a thumb and forefinger thing;-) Second thing, get your tremolo down(a five stroke roll is good to work on) and fool around a bit with what would be hammer-on/pull-off in closed positions, except that you are striking the string--it kind of goes that way--you will hear it a lot in Romanian folk music--it sounds very frenzied, but really moves around on only a few notes--the feeling of speed is created because the rhythm guitar is very staccato and precise, but the lead player is erratic, moving from dragging half and whole notes to tremolos and trills--next, you through in some brilliant melodic variations, and you've got it!