hi, i have a 1996 marshall valvestate and my line out doesnt seem to be working. when i plug a cable into the line out jack there's a feedback type noise comming out of my amp as if it were cranked really loud. i'm trying to use it for mixcraft because i don't have a mic for my amp right now so any help would be nice.
thank you
is the feedback noise coming out of the line out signal, from the amp cabinet or both?

it would also be nice to know what model you have. if it is a head and you aren't getting feedback from the line out signal then i would say you should just unplug the speaker. the amp can operate just fine that way.
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