Adjusting Relative Volume Levels Globally

Sounds like you are on it.

Using the Keyboard in the following example, I type in -6 and using the Keyboard hit Enter.

Yes, select the Timeline clips and not clips in the Browser.

All clips are lowered by -6db from the original audio level.

The other command, Absolute adjusts everything that is selected to that value.

If +5db is typed in every selected clip will have +5db as it's audio level.

Al

Use Command-A to select all clips in the Project.

Then use the Relative command.

You will see this at the top of the Timeline:

Type in a number for raising the db level, no need to enter a +, or enter - then a number to lower the db level.

eg. -6 then hit the Enter key will lower all levels on all selected clips Relative to their starting point.

Al

I still don't know what that thing is you have in the inspector. Your inspector has 245 separate items of which 163 are selected. Some of them clearly don't allow audio control. Did you try the keyboard shortcut; it might work in this instance? The viewer indicates you have an effect selected, and the project isn't active.

Normally there's a slider opposite volume. What exactly is that in the timeline? It's not something something I remember seeing. You can also use Control plus or minus to raise and lower the level.

Isn't the blue '+' in the middle of the screen what you're looking for?