I used to get a "boop" every time someone posted in the chat box. You can turn that off in the chat box settings. Not sure if that's what you mean or not cause I've never had any other type of audible notification on this site.
On my tabs (chrome) I see the speaker icon indicating a sound is playing from that tab. But generally I'm at work and have the laptop muted so I have no idea what is making sound on that tab. I haven't paid enough attention to see which tabs it does it for, so I have no idea if it is indicating opening a thread, a thread with new posts, a thread that sings a happy song about how many likes, or what.
I used to get a "boop" every time someone posted in the chat box. You can turn that off in the chat box settings. Not sure if that's what you mean or not cause I've never had any other type of audible notification on this site.
It has to be the chat box. I had GC open on one screen, and was watching a movie on my other one. The film's audio was constantly mixed with that "boop" sound from replies in the chat box. Now I see there is a way to turn it off, thank God.