Hi Angela: Unfortunately, this is a limitation that 's caused by the fact that the mapping between an endpoint and FX is by KSNodeType. In your case, you might want to consider applying the same APO to both endpoints in the INF and adding some logics inside the APO to distinguish those two endpoints (render and capture) before deciding what actual APO to use. Thanks Cheng-mean From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Yan Yan Sent: Tuesday, July 13, 2010 2:11 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Register different APOs in inf for endpoints with the same KSNODETYPE Hi All, Greetings. I have a USB audio device that exposes a line-in terminal and line-out terminal. This will end up as a filter with a line-in endpoint and a line-out endpoint on MS USB audio driver. I need to register different APOs and some other information to the line-in and line-out endpoint. I did some experiment in both Vista and Win 7, it seems that the only place that I can make my FX\\ and EP\\ information go into the property store is to put the infomation in the following place in the inf: AddInterface=%KSCATEGORY_AUDIO%,%KSNAME_DeviceA%, DeviceA.RegisterAPO However, since there is only 1 KSNODETYPE: KSNODETYPE_LINE_CONNECTOR for both line-in and line-out, there is no way to separate the APO information for both endpoints in this case. If I try to register APO while the render and capture interfaces are getting register : AddInterface=%KSCATEGORY_RENDER%,%KSNAME_DeviceA%, DeviceA.RegisterAPORender AddInterface=%KSCATEGORY_CAPTURE%,%KSNAME_DeviceA%, DeviceA.RegisterAPOCapture The FX\\ and EP\\ information in my inf will never go into the OS. In Vista, the whole "FxProperty" key is not shown in registry. In Win7, it shows MS APO information in FxProperty key. Anyone knows how to do this in inf? Any help wil be greatly appreciated. Regards, Angela ________________________________ Hotmail: Free, trusted and rich email service. Get it now.<https://signup.live.com/signup.aspx?id=60969>