Master Audio Layer for Simplified Audio Output
Millumin should have the ability to designate a master audio layer in a show file so that when you're playing the same video to multiple outputs, the stereo LR of the playback computer doesn't get a doubled audio output. Alternatively, the ability to mute the audio output of an entire layer should exist, not just on a per clip basis.
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In Millumin V5, you can mute the whole layer (set the audio-volume to 0%).
However, if you run the same content on several place in your canvases, you should rather use copy-layers. Or a video-routing.