I'm not quite sure myself.
I think the idea is that if you have really low levels, the meters will still show movement.
Right now, if you are at low levels, the meters don't really do much of anything. They just have a little bar at the bottom. So you can't compare the low level tracks visually.
I'm thinking maybe there is a way for the meters to show the dynamics of the part even at low volumes, instead of just showing a tiny little bump at the bottom of the meter.
or in other words, make a meter that peaks at -15 look like it's peaking at -3.