Feature request: Global 'Mute' button

[Fuddl1]

Hi Teddy,

I frequently face the need for a single button and/or keyboard shortcut that mutes every locomotive at once, and vice versa. Uses cases are, e.g., easily reduce the noise level for a conversation, picking up a phone call or wondering if somebody called my name or if the doorbell rang.

Neither shutting down the track power nor muting each locomotives one-by-one work really well for the above situations.

Cheers,
Fuddl