[OOPS! I'd posted this message with incorrect subject!] The "USB Audio and Windows" whitepaper (available from http://www.microsoft.com/whdc/hwdev/tech/audio/USBaud.mspx[1]) says: "Starting with Windows 98, Usbaudio.sys supported the adaptive and synchronous endpoints, but it did not implement the asynchronous endpoint correctly. Full support for asynchronous endpoints in Usbaudio.sys is plannedfor Windows Longhorn." However, I have implemented async. isoch. synch. mechanism on two different devices - and it has worked perfectly - starting from Windows 98 SE. What's not correct about the implementation? Thanks. Devendra. --- Links --- 1 http://www.microsoft.com/whdc/hwdev/tech/audio/USBaud.mspx ****************** 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/