Massive question about Mixconsole

I can’t see what’s funny. The faders are always on zero and I can still hear the music normally.
And what’s a “midi fader”? There’s nothing in the manual on it. What could it fade? Midi events? Volume? Whatever it is, mine doesn’t work.

Yes, I have set main volume levels in the key edit controller lane, but this doesn’t change any of the fader postions of the mixers which now remain resolutely on zero. But they look nice. I look at them now and again to remind myself of what a great product I have. I’m serious.
As you can see from the pic., all the faders are on zero but the music still comes through!