One is wet and one is dry, for the effects on the amp. Mine sounded better with a stereo cab, a lot clearer and less muddy, but the main problem I had before I got a stereo cab was the chorus made noise and sounded horrible. It always had more than enough distortion...there has to be something wrong with yours. I wish I was more electronically adept to help more, but I assure you these are not normally shitty sounding amps.

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