Muting audio of a Video Track?

Can’t find an audio mute button for montage video tracks. The manual does not seem to indicate whether there is a mute or not. Kind of hard to work on the real audio when the video’s temp audio is playing back at the same time.

Am I missing something? Thanks in advance.

A video track has no audio, hence no need for a mute button.
If a video file has a video track, this one is decoded in a separate standard audio track (hence with a mute button).