Thanks, with that setting ReClock starts fine. But it doesn't detect the display frame rate correctly. So it's no solution for me. waveout also goes through the kernel mixer. See here: http://forums.winamp.com/showthread.php?s=&threadid=100492 "In win2k/xp (WDM), waveOut and DirectSound are just 2 different pathes of passing PCM data to windows kernel mixer."