Edit the volume of multiple tracks simultaneously

First, I apologize for my bad English.
I'm using Sonar X3 and have some questions that I believe are very basic, but has not yet found an easy way to resolve them.
1 - I have a project with several layers, each with its volume individually unset.
How do I lower the volume of all layers at the same time without having to do it one by one and without changing the master layer?
2 - I have a layer that uses automation in volume.
How do I lower the volume of the entire automation without having to do this individually at each point where the volume changes?
Also in a way that is more accurate than selecting all points and lower the volume using the mouse.
I thank you all.

1. I'm going to assume that by "layers", you mean tracks. you can "quick group" track controls by selecting both tracks, and holding Ctrl while you adjust any control in one of them to get a matching change in the other. Or you can permanently group them by right-clicking each control, and adding it to a Group.
 
2. If you hit O on your keyboard, SONAR will enter Offset mode. You'll see a '+' in the volume and other controls. In this mode, you can offset the Volume level, and the automation envelope will "ride on top" of this offset level when you hit O again to return to Envelope mode. Just be careful not to leave it in Offset mode.