I was on tour a few weeks ago and I played cornerstone and a few other dates, my head took a beating with the heat but it played fine all tour. I haven't used it for about 4 days sense tour and today at practice I turned it on and my bass wasn't even plugged in and it was producing a low humming sound. No matter what I did with the EQ or other nobs it would buzz unless I turned the master volume down. Also when I play it doesn't get very loud at all. Could it have something to do with the power supply? Or something relating to it. Thanks for your time.