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Oh. Well, you may have to do sound alignment. The good news is you use live sound for the source, and a VTVM. Sounds pretty easy. The factory procedure is wanting a "sound detector probe" though. I dont know whats in that one. I'll bet a regular detector probe would work. I'll dig a little deeper.

Set the AGC on your strongest signal source. You should be able to turn it up until the picture "shifts" suddenly, probably down and to the right, then just back off a little.