I am new to audio driver, especially to portcls audio driver. I developed an avstream virtual audio driver, and knew a little bit about avstream driver. In avstream driver, Ikscontrol interface is implemented on avstream filters and pins. clients in kernel mode can access avstream automation objects (properties, events and methods) through Ikscontrol. I just wonder if portcls has this kind of function? Thanks for your help. Yong