AUTUpStageTeam/upstage2013 — pull request #75 by dekpient (2013-08-31 06:09:00+00:00)
Title: Mute/unmute a streaming avatar using its context menu

Hold a streaming avatar and right-click on it to toggle its streaming audio. All audiences will stop hearing the streaming sound.

This doesn't stop the streaming audio from Red5 Publisher, it just sets the volume to 0.
If UpStage uses its own version of Publisher in the future, then this should be reworked.