I'm running Vegas 12 in a Windows 7 VirtualBox virtual machine. Everything works great except there is a half second audio delay when playing in the timeline, and the resulting played back audio does not line up with the waveform as the time cursor passes it. It's not a virtual machine problem because I click the volume adjustment and I get an instant ding. I checked the buffering and delay settings under the audio device tab and also selected between Windows Sound Mapper, DirectSound, and wave driver with no change. Is there something else I can check?