Hi, I work on audio miniport drivers which need to talk to a KMDF based driver. When I tried to use WDM based APIs to send IOCTL it never seems to be working. But when I tried to use KMDF APIs then everything was working fine but I'm not sure if its a good design to use KMDF APIsinside a WDM based drivers. I would appreciate if someone could answer what are the drawbacks/repercussions of this approach. Thanks, Suneeth