I just checked, and it looks (sounds) like DirecTV is passing the second-audio.
Couldn't figure out how to tell on DISH Network.
Not sure if we ever got things set up with Comcast, yet....maybe by next week.
I did notice at home, that NBC shows like "Law and Order, SVU" actually have a really loud mono mix on the right channel, and Descriptive Video Service on the left. You can use the balance control (wish I had one
) to mix it to your own tastes. NBC did not tell me there was a mono main on the right.