Hi, All: I am newbie in driver developing. I want to implement a virtual audio driver working under win9x and nt base system such as win2000, windows xp. 1. Can the msvad example in XP ddk be used in win9x? It seems to be a wdm driver. 2. The virtual driver need to be transparent, it will send the data to an actural sound card. How can I do this in the driver? Thanks ****************** 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/