I just purchased a rock band 2 special edition drum set with the cymbals. The correct drum light (top center blue circle) was on when I started the sync activity. The dongle flashes blue, but the drum set now flashes the 4 blue lights near the bottom. MY first thought was that the batteries were near dead and the 4 blue lights were an indication of low voltage. Fresh Duracells did not solve the problem. My question is…what do the 4 flashing lights indicate? Thanks in advance for any suggestions.