This is a helpful thread. I went to the Help to read about the Mixer.
I wanted to cement the operation of the modifier keys on the track volumes in my mind.

I learned some helpful things.
1) There is a TONE adjustment on each of the Tracks. From Full Bass to Full Treble. pleasant surprise Oh My!

2) According to the Win2021 Help in the Mixer Window section
the Ctrl, Shift and Double-click operate a bit differently on my system.
Double-click = reset to default
Ctrl + drag the slider = all tracks align to the same setting value being dragged
Shift + drag = all tracks are moved while keeping the relative setting differences

cheers! RrR