I have 5 clips that I want to set audio levels at the browser level, so anytime I use them they will be at a consistent level. Basically, I want to use the copy and paste attribute at the browser level.
What you could do is make a new sequence, drag all of you audio clips into the sequence... Adjust one of the clips, copy, then select the rest of the clips, paste attributes, then proceed to drag everything back to your browser.
You could also use an applescript / TextEdit combo to automate this. Export an xml of a bin, use applescript and TextEdit to change the levels on each clip. You could either save to the same xml or make a new name to differentiate. Import new xml and the entire bin should be changed the same way.
For that matter, you could set the applescript up with a couple/few dialogs for input and tell the script to change all the levels and by how much, set pan, apply video and audio effects with the parameters you want already set ... etc. And if you generate a new xml and import it, you never have to quit FCP. Huh ... I may have just talked myself into a project.
Anyway, it's possible to automate it but you'll have to put some time into Applescript and TextEdit to get there.