If you have Xifinity remote, go to settings look for secondary audio, check other settings also. We added a Vizio surround sounds to our Vizio TV and had multiple problems that got to the point of having Geek Squad come out. Even after they left, there were still some problems, finally found solution was in the settings on the comcast (xifinty) dvr. Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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