Ok I figured it out. Turns out I had installed "Legacy USB Support" with multibeast before, and its apparently not needed ( i have an 1156 motherboard and things are working fine without it now). I had to copy over /System/Library/Extensions/IOUSBFamily.kext from another working ML system, and...
Same here - having this issue with two different USB headsets that used to work fine. I recently did the supplemental update, that's all i can think of. Latest version of mountain lion. Headset's show up in System Information under USB, but not in audio pref pane.
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