I'm sure a lot of us who in here deals with this issue and it's very annoying to track quickly or find out who's avatar is emitting global audio sound or other audio sounds.
It would be a nice addition to VRC itself, as well as moderation to have a way to find out which users are emitting Avatar Sounds or Global Audio sounds and not having to turn/off every avatar in an instance which can be quite tedious and time consuming.
Excuse my Microsoft paint Drawing skill, but it would be nice to have it in the 'Instance' Tab, as that's where I and I think most of us look for people talking/playing audio to disrupt other issues, especially when they're hiding in meshes. The blue (Which we already have) shows Voice being transmitted, the red on the right would indicate if an user is emitting Avatar Audio the left when Voice is transmitted.