How to make the volume knob on my headset work

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https://bbs.archlinux.org – I have a Turtle Beach PX3.  It's a USB wireless headset.  I got the sound working and everything and I can control the volume through the XFCE mixer or the ALSA mixer but I would like to be able to use the physical knob.  On Windows 7, it just sends a signal to bump up the volume in the software mixer much like the volume controls on a keyboard would.  For the short time I used Xubuntu 12.04 it recognized that I was moving the knob (it popped up a volume bar) but it seemed to be adjusting the wrong thing because the volume didn't actually change.  On Arch, it (HowTos)