Adjusting Automation

I find the Offset function in Sonar extremely confusion and after many threads on this forum still do not understand it.
 
Isn't there something—similar to a Find/Change command or a CAL script—that will just adjust all the automation?  For example, if I wanted to lower everything 1.5 db, isn't there something better than editing every node?
 
Thanks.

I'm not sure what the mystery is about the offset mode.  Highlight your track, hit the letter O, lower the track 1.5db, hit O again and you're done.  That will lower all the nodes in your envelope by the desired amount.  Just don't forget to hit the letter O after you make your adjustment, or you will be confused at some point.  You can also position your cursor at the top of a clip and drag the entire envelope up or down when in clip automation mode, but that's time consuming if you have many clips to adjust.  That's my understanding of how the offset mode works.

noynekker has a good method.
 
There is also a hotspot at the top of the track in track view you can use to reduce all automation at once. Like noynekker, I use the shift key to prevent drift on the x axis.

Thanks, guys.  I think the excellent information above will do what I need.
 
Regarding Offset, if you really want to know why I am confused, I will tell you.
 
• It is not clear to me if the changes you make in Offset mode are still there when you leave Offset mode.
• Or, is it that making a change in Offset mode is only good as long as you are in Offset mode?
• Does Offset affect the whole track, just a selected region, or....?
• Would Offset change the perceived volume while leaving the automation nodes in the same place?  For example, would my fader be at 0 but I would really be hearing -4?
• Is Offset global or per track?  If I hit O on the keyboard, and three tracks are selected, are those three tracks in Offset, or is only one in Offset, or are all tracks in the project in Offset?  I THINK Offset only works for one track, but I am not sure.
• Check out this passage from the Sonar help to see why I am confused:
 
"In Offset mode, you “offset” the current automation in a track using a parameter’s controls. For example, if a pan envelope is set to hard left (100% left) and you adjust the pan in offset mode to 100% right, then the pan parameter is now set to hard right. Setting the pan in offset mode to 50% right would set the pan to the center."
 
Don't feel obligated to explain if you don't want to.  I just thought I would explain why this thing people say is simple is not clear to me.

Very good explanation, Geoff.  Thank you, sir.