Hi all, I'm trying to figure out whether its possible to create a software-only GFX APO so that a customer can download and install a software package which affects all audio coming out of the machine. Would it feasible to create an install program which: 1. registers a new APO dll. 2. creates or overwrites the following registry key with the CLSID of the new APO: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\<endpo int>\FxProperties\d04e05a6-594b-4fb6-a80d-01af5eed7d1d},2 3. creates or overwrites the following registry key with the CLSID of the new property page: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\Audio\Render\<endpo int>\FxProperties\d04e05a6-594b-4fb6-a80d-01af5eed7d1d},3 4. the original APO calls through to whatever APO was originally installed and then applies its effect afterwards. Now, I realise that the APO system is designed for IHVs, but does anybody have any comments on the feasibility of this approach? On a related question, Microsoft's sysfx.doc document says: Note: The INF does not modify the FXProperties registry key directly. Instead, it modifies the FX key as shown in the preceding example, and the value is then migrated to the FXProperties key in the MMDevice section. In other words, at some point, the APO settings from HKLM\SYSTEM\CurrentControlSet\Control\DeviceClasses\... to HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\MMDevices\... Is anybody able to explain when or how this migration takes place, and which keys are migrated? Any help you can offer would be greatly appreciated. Thanks, Richard Cartwright Chunk Systems http://www.chunksystems.com ****************** 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/