I just bought a Panasonic WJ-MX20 video mixer from my local access station. The problem is, I didn't get a manual and can't quite figure how to work the thing. It was used for a TV production class, and as such, the students have some pretty weird settings that I can't quite figure out how to remove. Does anyone know a)where to find a manual online or b)how to reset one of these mixers to factory defaults? Any help would be appreciated!