I was gigging last night and used only one chennel and didn't even think to plug my xlr cable into the left channel. normally i run both channels to the mixer, but last night was a different band i was with and since i was so used to running in stereo for the last year, it slipped my mind. amp ran fine all night, but in 3rd set, the soundman told me he lost the guitar signal. does plugging into only the right channel fry the output?