Hi, I am trying to implement code so that our driver can report new format capabilities under Win 7 using "Dynamic format changes". Our audio driver has been written using "Streaming minidriver" model. So I am using KSEVENT_PINCAPS_FORMATCHANGE event to implement this. In order to do this I do the following in audio minidriver: - Added KSEVENT_TABLE with a KSEVENT_ITEM entry for KSEVENT_PINCAPS_FORMATCHANGE. - Added KSEVENT_SET_TABLE with a KSEVENT_SET entry for KSEVENTSETID_PinCapsChange. - Added event details in structure- HW_STREAM_INFORMATION. - Implemented StrMiniEvent. - Provided "HwEventRoutine" in Open Stream call. I am not receiving any event callbacks from class driver so I am wondering if I am doing something wrong here. Any help is appreciated. Thanks, Neetu.