Hopefully this is not something that changes from Vista to Vista, and hopefully this is understandable... Anyways, I'm the kind of guy who really wants to control stuff and so I wanted to find where Vista sound comes into the DSP and after reading, searching and testing I've found some interesting details that I don't believe is posted any clear to find place. The thing that made it all understandable was when I understood that which FxBus Vista sends sound to is based on a setting in Vista Control Panel. That is when you open the control panel in classic mode and choose "sound" you get a list of devices, on my computer it looks like this: * SPDIF/AC3 Out * Master Mixer * Wave Out 2/3 * Wave Out 4/5 * Wave Out 6/7 Then Vista has something called "standard device" (green sign), and this is where it gets tricky. If you set the standard to any Wave Out Vista only produces Stereo sound on the corresponding FxBus (2/3, 4/5 or 6/7). (Also, I should mention that you have to restart your sound source [movie, mp3] after changing standard before it comes to effect). I am still experimenting, but at least I found out that if I set standard to Master Mixer and play a 5.1 source it will output to FxBus 2-7. Also, currently, with Master Mixer as standard I get no sound from ProFx Src plugings, but the FxBus works great. I will post some other results when I have tested some more. Thought this could be usesful for someone else as well. I would be glad to hear if anyone has any comments or similar experiences and if this works the same on other computers. I have the original Audigy card and use kX 3545b on Vista Ultima 32bit.