Specifically?
It uses the standard USB Audio CODEC. For some reason, at work on a Win2000 system, I'm able to use Kernel Streaming out of foobar2k for, presumably, bitperfect output that passes kmixer nastiness. (I'm assuming this, not any expert). But for some reason at home, on my WinXP desktop and notebook, Kernel Streaming doesnt work, and I need to resort to DirectSound or waveOut, which doesn't sound as good to me (but frankly, may simply be in my head.)
Best regards,
-Jason