Nugen wrote: > > I would like to use DirectKS to access directly the usbaudio.sys > to capture audio from an external usb device. > I read about DirectKS, AVStream and audio.sys articles, but i can't find > a way to understand really how to start my application... > Does anyone can give me a link or any help to understand at a higher > level what > are the differents steps and call i have to do to find my device, and > communicate with it in that way? If you are really just starting out, then forget about DirectKS and just write a standard waveIn or DirectShow application to get your data. After you get that working, you can decide whether the performance is adequate or not. There seems to be a common but mistaken impression that DirectKS is somehow vastly superior to the standard multimedia APIs, just like there is a mistaken impression that code runs faster in kernel mode than in user mode. Neither statement is true. -- Tim Roberts, timr@xxxxxxxxx Providenza & Boekelheide, Inc.