Modify Volume slider in all tracks including those automated?

[Francoteves]

Hello friends,

How could I modify the volume on all the tracks at once including those that are automated. I need to open room for other instruments and already have the majority automated so it would be a pain to modify envelope by envelope everytime I want to make an overall adjustment. Thank you very much. 

[scook]

To modify volume for tracks with volume envelopes use offset mode. recently discussed here

Tracks without volume envelopes may be adjusted together too by creating a quick group.

Quick groups are also discussed in the linked post.