In the "Sound" control panel (mmsys.cpl), if you look at the properties for the SPDIF "endpoint device" there is a propertypage titled "Supported Formats". Is the WMA box checked? If you highlight WMA and hit the Test button, what happens? Regards, Mitch Rundle 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 tachunir@xxxxxxxxxxxxxxxx Sent: Tuesday, October 31, 2006 1:37 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] WMA pro pass thru mode on Vista Hi, I've implemented a WaveCyclic driver with SPDIF capability. For the digital output pass thru modes, Dolby Digital and DTS work fine, but it doesn't work with WMA pro. Same implementation works on XP. I wonder if there's anything (related to WMA pro) being handled differently in Vista (RC2)? Are there new interfaces I need to implement (DRM?) Or it's because my driver is not signed? Thanks! __T ****************** 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.com/