[ubuntu] LX-3000: Audio on right side only

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http://ubuntuforums.org – I have an LX-3000 USB headset. It's a pretty generic audio device and Ubuntu worked fine with it, but some time ago something changed and now I can only hear audio out of the right side. The left side has no audio at all. I've double-checked my pulseaudio volume settings and it does indeed indicate that audio is being received from both sides and that both sides of the sink's volume are up. Any ideas? (Hardware)