Even if you could insert yourself between a WaveRT driver and the OS there is no audio data for you to process given the driver model. You may want to read about WaveRT here: http://www.microsoft.com/whdc/device/audio/wavertport.mspx Also, the use of filter drivers in kernel mode to add undiscoverable audio processing is STRONGLY discouraged and has not, is not and will not be supported by the Windows Audio team. Sincerely, Hakon Strande Program Manager Integrated, Internal, External, and Wireless Audio Devices MediaTech/DMD/Windows Client/Microsoft ________________________________ From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Harsha HS Sent: Wednesday, October 11, 2006 11:24 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] KsCreatePin Failure Hi All, We have filter driver , which makes a KsCreatePin call and has been working well for both vista and XP platforms. KsCreatePin returns succes , when we load the above driver over WaveCyclic or WavePCI drivers. But the same function returns Failure when we load it over WaveRT driver.It returns STATUS_NO_MATCH. Has anybody seen this error code on the KsCreatePin call? I'm looking for suggestions on where to turn in troubleshooting. The controller is an Azalia HD part(Realtek HDAudio). Thanks in advance for any suggestions. Thanks and regards -harsha ________________________________ Do you Yahoo!? Get on board. You're invited <http://us.rd.yahoo.com/evt=40791/*http:/advision.webevents.yahoo.com/ma ilbeta> to try the new Yahoo! Mail.