#1
i got a big muff less then a month ago and its already messed up....the light turns on...but no sound comes out of my amp when on.....i turn my big muff off...the sound comes out of my amp? what the heck?
#3
Yeah, try changing the battery, it happened to mine a week or two after i got it.
The battery change fixed it.

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#4
Get a new girlfriend.

Failing what the others have said, i'd suggest returning for another.
Gear:
Gibson Les Paul Custom
Epiphone EDS-1275
Epiphone Les Paul
Schecter C-1+
Peavey Delta Blues