How do I use Microsoft LiveChat LX-3000?

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http://askubuntu.com – Work gave me a LifeChat LX-3000 headset. I plugged it in, and now Mixer shows it in a bunch of options. But it doesn't matter which one I select, I can't get sound to go out to the device, not even in Skype which is what I want it for. What am I missing? :~> cat /etc/lsb-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=11.10 DISTRIB_CODENAME=oneiric DISTRIB_DESCRIPTION="Ubuntu 11.10" Using XFCE4. (HowTos)