How's your 2nd fret looking? Any big grooves, nicks, dents, etc, in that area? , does it buzz anywhere else? Do you only hear the buzz thru the amp, or can you hear it unplugged too?..............If the answers to all the above is yes, you probaly have a badly worn fret and need to have a good tech check it out, you may just need the frets leveled, or possibly a partial/complete refret, but have a tech take a look...............