I'm still running 10.4.11 on my G4 music recording system. A known problem with the system up until this point (is it fixed yet? don't know...) is that if you rapidly tap the keyboard's "Volume Up/Volume Down" keys it can throw the left—right stereo balance off center. To fix it you have to open the Sound Preferences Pane and manually drag the little slider to re-center it.
I've looked in vain for a Menulet which would put a Balance control in the Menu Bar, but as far as I can tell, this is a problem nobody has ever addressed.
Has anyone ever seen one? I'd be massively grateful if anyone knows of such a little beast and could point me toward it.