Roamio Sound Issue **Solved**
My OTA stopped using sound and I wrote support via email, read forums here and posts online and tried several things to no result. Nothing changed. Was working now not!! All other components working flawless.
So I re-ran setup completely. 30 minutes later same result.
It's a lazy Sunday and I have other entertainment so the TiVo was playing on the TV with no sound. And I started exploring the menus. I saw an item that read 'Standby' and I thought what is this? A screen full of message came on but before I could read it all the unit went into standby. Never knew you could do that, never done it before. Understand I had unplugged the unit and waited 15 mins before plugging back in yesterday. And tried to sync the tv and everything else (Dolby --> PCM). It was working before why change settings?
I had read enough of the info messages before to know you push the tivo button to come out of standby, I did, and the sound returned.
Your guess is a good as mine.