Was practicing on my LD15 no problems sound was fine. Took a break and when I turned it back on it just buzzes, tried different cables and another guitar and still only get a buzzing sound from the speaker. Tried the factory reset but still just get a buzzing sound. Any ideas volume was only about halfway when I took a break. I have tested the speaker by plugging my iPhone into the Aux jack and running Pandora, speaker sounds great.