Outputting two mono channels is often needed for certain really crappy venues that downmix everything to mono from stereo -- if you don't provide both channels the mains levels would be half what they should be.
Removing Master Mix might be possible
Outputting two mono channels is often needed for certain really crappy venues that downmix everything to mono from stereo -- if you don't provide both channels the mains levels would be half what they should be.
Removing Master Mix might be possible