No audio on Fox with Soundbar

I’ve got a Polk Audio 3000 Soundbar and a Sony Bravia kdl-46ex500 TV. I have Frndly and use Tablo to watch TV. With the Frndly app I’ve got audio on MeTV, MeTV Plus and MeTV Toons, but on Tablo I can’t get audio working on MeTV, MeTV Toons and just the normal Fox channel.

To get audio on Fox I’ve had to switch it back from audio system to TV speakers, I’ve tried changing the audio settings but trying to select stereo like Tablo suggested if the other settings didn’t work, only act like it’s going to load the channel and drop right back to the channel listing, anything else I can do?