I think finger tapping is what i think it is but if its not that the n whatever but when i play the beggining of thef fast lead that Kirk Hammett from Metallica plays in the song "one", i can tap the fast part but when i put my pedal on i am getting alot of feedback and stuff because its hard keeping my palm to mute the upper strings while i tap the bottom string fast. Its easy to tap but it comes along with the other strings feeding back. anyone have any suggestions?