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As of yesterday, the audio feed mutes whenever I open the Guide or access other background settings. How can I restore the audio setting that allows me to hear my active channel while I look for content on other channels? This is a bug, not a feature! (In case it matters, I use the Tivo Bolt combination with Cox cable card and tuning adapter.)
Nevermind. I found it. (Settings / User Preferences / Video Window & Background / Display video: Yes, ...)