Question / Help How to mute or lower "Video Game Capture Device" sound

[Vegas Halo]

I have an Elgato capture card. I would like to mute the game audio sometimes without going to edit the properties of the source because when I do that it makes the capture card "load" again. I do not want that on stream. Am I missing something? I'm looking to mute or lower volume as quickly as we can with mic and desktop audio.

Thanks in advance.