[Alizarin]

usphil -
I I found a trick to play no sound channels:

While playing a no sound channel, press the back button to return channel list (don't stop) then click on that channel again, it will play with sound.

If playing with PVR IPTV, go direct to those channels by pressing channel number while watching other channels.

The key is open no sound channels while playing another channel.

My system is CoreElec 9.2 run on TV box. I didn't check this on other systems.

AWESOME! Thanks! This worked for me on my Win10 Kodi 18.8 instances.

usphil -
It worked on my Win10 18.7 instance. I was able to get BBC America (one of a few that would) to produce sound and then was able to trigger TCM to produce sound.
However, in my Linux (elementaryOS/Ubuntu) 18.7 instance, nothing. The only channel that could produce sound was FilmRise which is VOD, not streaming. (I guess I ought to try updating to 18.8 to see if that works - however, the AppStore on elementary is still pushing 18.7.)
As noted before, all channels on Sling with this addon (with the PVR) run perfectly on Android under Leia 18.3 (18.8 bombs loading streams).

I wonder why the work-around works at all. Is that a clue as to why the others (including n Linux) are running silent? Is it a port that get forced open? Is there an automatic setting we need to run manually - or vice-versa?
Ideas?