Dear All: I own an AVStream audio driver and can show it in the control panel's "Sound's and Audio Devices" folder. Now, we wish to add an Audio Volume Property into the driver. So end-user can access the property by Taskbar's Volume Dialog. I have added the property into KSNODETYPE_VOLUME's KSNODE_DESCRIPTOR structure. However, why cannot the volume dialog be showed? We need other setting? Best Regards, H.P.