Does the 3000 have a 'Volume' plug in the back? You know, a place to plug in a volume or expression pedal? Is there a foot switch plugged in to this plugin by mistake?

Happened to me once. I accidently plugged in one of my foot-switches into the volume plugin and the end result...no sound. I went bonkers trying to troubleshoot it and laughed when I finally found it.

-mike