That structure is not for audio sysfx APOs. Frank Yerrace Microsoft This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Dennis Scott Sent: Sunday, November 01, 2009 9:20 PM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] How to use structure "AUDIO_ENDPOINT_SHARED_CREATE_PARAMS" in APO (lfx / gfx) hi all, How can i use the structure AUDIO_ENDPOINT_SHARED_CREATE_PARAMS in my APO?, i am not able to found any Api's that use this structure. dennis scott