dear all: I have a usb device include microphone , but No comply usb audio class, it only supports interrupt transfers,Now I need to develop a WDM Audio driver using it. And the device should be able to be used by NetMeeting as a system sound device. How to write USB Audio Driver ??? ( had any for usb audio device sample code) thanks.......... ---------------------------------------------------------------------- 倚強科技股份有限公司 SERVICE & QUALITY TECHNOLOGY CO.,LTD. 台北市士林區承德路四段150號六樓 6F, No.150, Sec.4, Chengde Rd. Shrlin Chiu, Taipei, Taiwan, R.O.C. 高級研發工程師 Advanced R&D Engineer 劉恆賓 Rex Liu TEL: 886-2-6611-1177 EXT: 743 FAX: 886-2-6610-6777 email: rex@xxxxxxxxx http://www.sq.com.tw/