I have a Mac Pro and not too long ago I swapped from a fat, heavy and filthy white Apple Keyboard to a new skinny silver one. I like it, and also love that the F7-9 Skip Back-Pause/Play-Skip Forward keys work for iTunes, even when another app is active (what's the word I'm looking for - in focus or whatever). But I use Optical output, so the volume keys (F10-12) don't do anything. I know that, when iTunes is the active app, I can command-+/- to change the volume, but I'd love to be able to map the F10-12 keys to do that - without having to have iTunes active (playing, but not the active window). Impossible?