Request: Mixer 8, cv input for all mute

[fulhjort]

I would love to have an input for muting the mixer completely. Technically I could of course use the mute inputs for each seperate channel, but there are times when I have something muting for example channel 1 and 2 with different gates, it would then be tricky to mute both channels with a third gate - thus creating a need for a "mute all" cv input.