After trying all kinds of shenanigans over the years to get it so I could watch the Red Sox on television and listen to the radio crew call the game, turns out it was available all along. No audio and or video delaying software required, all I had to do was subscribe to MLB.TV, install their NextDef add-in and that combination is right there for the selecting.
I don’t see it tonight, but last night I could select no audio and just have the stadium crowd noise while viewing the game. Tried it for a bit, and while interesting, I couldn’t do it. Maybe if I just watched the game instead of my usual internet surfing multitasking…