Loosen the 1/4" jack at the bottom of the uke a little bit. Stick theend of a sharpened pencil in it and rotate it (either or both directions) while strumming and stop rotating when the buzzing stops. Keep the pencil in the jack, while retightening, to keep the jack from moving. Another thing about the UAE20. The realy open up with rich tone and volume over a long period of regular playing. I demonstarted this to a local shop owner with my two and the one he has on display. He was amazed at the difference. My black one is over a year old and is full of tone and volume. I've had my red/black one for about 4 months, now and it has more tone and volume than the one on his display. If you have not yet done so, change the strings to Aquila Concerts. They make a big difference. Ric