Hi, I try to add the "Dynamic Format Change Support" which is documented in here: http://msdn.microsoft.com/en-us/library/windows/hardware/gg463055.aspx <http://msdn.microsoft.com/en-us/library/windows/hardware/gg463055.aspx> to my miniport driver. I was able to register the events to get calls to my EventHandlerFormatChange and to my PropertyHandlerPinProposeForma function (both taken from the document above). I also see the KSPROPERTY_TYPE_SET and KSPROPERTY_TYPE_GET calls and everything seem to be OK. There are some things I'm missing or do not understand well: For example I have a device which provides Ch 1/2 and Ch 3/4 Out and Input 1/2 and I want to keep the sample rate settings synchronised for all of them. So I guess I should get a KSPROPERTY_TYPE_GET for each device after I changed the sample rate for one of them to synchronise the others to the new "default" sample rate. Is this correct ? The problem is I never get this call. I only get a call to KSPROPERTY_TYPE_GET once when I open the device in the Windows CPL. There are two parts in the sample code I don't understand and are probably related: NTSTATUS CMiniportHelper::GenerateFormatChangeEvent() which calls: m_pPortEvents->GenerateEventList(...,...,...); where should I instantiate the pPortEvents and where do I call the GenerateFormatChangeEvent ? The source code(which I didn't write by my self) calls once: pPort->QueryInterface (IID_IPortEvents, (PVOID *)&pPortEvents); in my Adapter->StartDevice function. Should I keep this instance ? also the "case PCEVENT_VERB_ADD:" in the EventHandlerFormatChange is never called, only "case PCEVENT_VERB_SUPPORT:" is called. Any suggestion what I'm doing wrong ? Another thing is how can I distinguish which pin is opened in the CPL ? Any idea ? Thanks and Regards,