Did you also install the mixer?
Once installed and put on the panel, but before you use it, right click on the mixer icon and change the settings around, then change them back to the correct settings and then save your changes. If you don't do this, the first time you put the mouse over the icon and move the wheel, the mixer will report an error and un-install itself from the panel. This has been reported by other users and I've seen it myself.
I had trouble with the volume keys in 4.8. Sometimes they worked, sometimes they didn't. They do work fine in Xfce 4.6.2, using the default keyboard selection.
Last edited by cwizardone; 10-12-2011 at 10:03 AM.
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