There is no documented way to do this. My usual follow up question: why do you want to? Frank Yerrace Microsoft Corporation This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Karthik Gurumurthy Sent: Wednesday, June 10, 2009 1:25 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] setting audio device as default from the VC++ Hi all, How can i set an audio device driver to default from an VC++ program. Karthik SG