I recently got a new tv (a very cheap TCL that seems to be working well) and hooked up my equally cheap sound bar (gorilla 2.1 from 2 1/2 years ago). Everything worked great, but last night my wife was switching TV channels, and the audio went out. I was already in bed when it happened so I wasn't able to troubleshoot until this morning. It seems there are three audio streams available on channels 1, 2 and 3 at least. 

The streams are labeled English 1, English 2 (with an eye and exclamation point), English 3. The channels were all set on English 3 which sounds best to me, but it seems when the channel switched something happened with the codec or similar and the audio stopped. I unplugged the soundbar and reset it which seems to have fixed the issue (for now) but I'm curious what the differences in the audio streams are. I'm guessing it's 5.1 (English 1), Descriptive Audio (English 3), 2.1 (English 3), which would explain English 3 sounding the best with the sound bar, but I cannot find any confirmation in all of my searching. Can anyone tell me if this is correct or where to find the codec information?