Kind of Ducking
To duck a soundbed of music or ambience you have to select many regions and reduce the levels by draging with the mouse and watching the target levels in the little window above the region.
If these target levels are the same over a wide range of the session, a big improvement could be this workflow:
You type the target level into an additional window of the session properties (or somewhere else).
Then select the ducking region as usual and press a shortcut - and the level will be reduced automatically to the predefined number.
What a time saving feature!
Alternatively you activate this kind of ducking and type in the target level. When drawing a selection the level reduces automativaly without any shortcut. The predefined level will stay the same until you type in a new number.