I figgered it had to do with the style being used. How that part might generate to fit the mix of that style. Never thought of the master slider being part of it, but I doubt it's the final out slider. Maybe the 'All' Slider toward right of mixer.(?)

Or not.
I just gain change and go if I need to. There is a trim dial that may adjust it too.
Click the audio FX area for a track and look in the pop up window bottom right.

I do not work here, but the benefits are still awesome
Make your sound your own!