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I have called Cox many time to complain that my DVR sound does not match the video. They usually just reboot my cable box and it is ok for a couple hours.
Last week I scheduled an appointment for a technician to check out my cable signal. It was confirmed it was fine. Technician replaced DVR with new Cisco DVR box.
The problem did not go away. Today I fixed problem.
1. Press Contour button
2. Select settings (icon al the way to the right).
3. Select Device Setting
5. Select HDMI Audio Output:
6.Change from Auto Detect (Dolby Digital 5.1) to Expert mode
Sound delay instantly fixed.
I hope this is useful to someone