Just in time for this.

Only for xbox 360, with HD-DVD add on, the new software update is available now, buit, in order to activate it, U needs play your HD-DVD movie.

Pls takes notes, thay u have to make your changes in the HD-DVD display menu not under the console settings. Press the DISPLAY button on your remote and then go to DIGITAL AUDIO SETTINGS. Defaults are DD and DRC off.

It is advisable, to set the DRC (Night Features) Off, and DTS & WMA Pro format now are available for your listening pleasure. And the most important updates is no more serious sounds related problem with the current released of HD-DVD. Takes note again, if u do have the new HD-DVD calibration software from Digital Video Essentials, it will only works once this update is installed.

Good Job, Microsoft 

Finally hooked up the player again to get the update and the first scene I tested was the first explosion scene in the movie Swordfish and oh boy, you can really detect the improvement!