[B-mtrd]

On most games or audio setups that would represent a master volume and all the rest are relative to it.

Not able to leave the house and confirm today but if you set the other bars to say 100% then listen. Now mice bottom to 50% if they all get quieter then it is a master volume.

If not then I join the no clue list and would love to know.

I’ll try that later today.
Yesterday when I was playing with it I move the volume knob and it only adjusted the music one. I turned up the bottom one and there was no change on the music volume.
I guess I was expecting to be able to turn up the music to 11