Hi, I decided to read though the WDK documenation again and I'm now back at the FMSynth example. I compiled it to a lib, however the documentation of the sample states that I'm supposed to link somewhere. ("which can be linked into an audio adapter driver.") Any ideas whats meant by this? I also tried to use the INF file of the AC97 sample, however when trying to install the AC97 driver with that INF, I get an error (translated) "This installation method is not supported by this INF file". - Xaser