Ability to Mute Mix master from soft key

Hi Folks,
The title says it all. Is there any way to Mute Mix masters from a soft key.
I have not figured it out.
cheers,
Mike

You probably saw this in the manual.

The following may be assigned to Mute Groups:

  • Mono and stereo Input Channels
  • <li>FX Send masters</li>
    
    <li>FX Return channels</li>
    

They don’t mention ant outputs.

Surely if you set a soft key to mute all channels it’ll be effectively the same as muting the master output? Either that or just press the Mute button on the master output?

This has nothing to do with FOH mix.
I have individual channel mutes setup and Fx mutes. That’s all good.
But when you have a Client jump on stage to do a speech or presentation
of some sort, it is really helpful to be able to mute all monitor mixes
quickly. Its just better that way.

cheers,
Mike