Hi There, I learned from WDK document that: GFX filter only exists on 32-bit versions of XP and Server 2003, and unlikely to run in later versions of Windows. Only for USB audio devices. But http://www.microsoft.com/whdc/device/audio/wavertport.mspx said, GFX can be tied to WaveRT driver in Vista. Does anybody know more about that: Does GFX exist on Vista? Is GFX not only for USB, but also for HD audio? Is there any difference between GFX on XP and GFX on Vista? Thanks so much. Best Regards Yi Zhang 2006-03-14 ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.com/