In Sceneline view, clickk on the Track Header to the left of the audio track and a slider will appear.
Unfortunately, Sceneline view is limited to only one video and a couple of audio tracks.
You can also, in Timeline view, just drag the yellow lines across every clip down -- but there's no way to do it to an entire track at once.
There are two ways using which we can mute the audio.
Hope it Helps
My question is how to mute one channel only - either the left or right channel (speaker). I believe that I now see how to do it with the balance controls, although the interaction of the keyframes with the balance controls was driving me nuts.
When I need to split channels in a 2-channel Audio file, in PrElements, I Share just that Audio to an intermediate file, and edit that in Adobe Audition, however, the free audio-editor, Audacity, will do it too.
In PrPro, one can Split Audio in a 2-channel, or 6-channel Audio file, and then edit each channel independently. Maybe PrE 11 will add that capability.