Hi, 1, Does Microsoft release USB2.0 audio driver for Win2000? I know Microsoft supports USB2.0 audio driver in Win XP SP2.but I have no idea about Win 2000. Does Microsoft support USB2.0 audio driver in Win2000 SP4? 2,How to write own USB2.0 audio driver for Win2000? If Microsoft does not, I have to write our own USB 2.0 driver for Win2K. Since our device (Audio & Video) needs to support both XT and Win2K. Microsoft DDK only give some PCI audio WDM driver source code. It is still difficult to modify it to USB audio WDM driver. Can someone kindly let me know where I can get USB audio WDM driver sample code? Thanks very much Jeff __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ****************** 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.de/