From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: assigned EHCI USB headset not working
Date: Wed, 08 Jun 2011 14:49:13 +0200
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   Hi,

> The sound device shows up under Windows7 and drivers are installed
> automatically. Unfortunately it does not work. All the players I tried,
> did not even start playing the sound file, although they detected the
> DirectSound Device.

iso xfer's from usb-linux via ehci are flaky for reasons not yet tracked 
down.

Any reason why you don't just plug in a virtual sound card?  The HDA 
emulation should work fine with win7.

cheers,
   Gerd