SPDIF & Built-in decoder

Hi everyone.
I have an X-FI Fatality (with remote & front bay) wich, as far as I know, is able to decode DTS & Dolby (In fact, I've been using that feature for a couples of years).
While using XP, to be able to use the DTS and Dolby decoder, I had to choose as the output for the player (for example, Powerdvd) SPDIF, and enable the internal decorder as well as the SPDIF-IN decode (in the SPDIF tab) at the soundcard control panel. When I played some content with DTS or Dolby, the black & white logo appeared at the bottom right corner. If the content was, for example, stereo, it worked anyway (That's the case of multiple audio format DVD's. If I chose the DTS track, it played decoded by the soundcar. If I chose the stereo one or played an AVI file, it also played).
Right now I'm, using Vista. To be able to make the decoding through the soundcard I have to change the default windows sound device (through windows control panel) to SPDIF output. Unless I change back the default sound device, I'm not able to play any other kind of audio (MP3, for exmaple).
So, the decoding is working. But it's pretty annoying to change the windows's sound settings everytime I want to watch a movie.
I'm the only one with this behaviour? Is it normal in Vista? Otherwise, do anyone know a possible solution or some kind of tip to guide me?
Thank you, in advance.
I hope you undertand what my issue is. Keep in mind that English is not my native language.

GcMaxx wrote: (through windows control panel) to SPDIF output. Unless I change back the default sound device, I'm not able to play any other kind of audio (MP3, for exmaple).
Why would you want to do this if you're using analogue connection to your speakers You obviously get nothing from the speakers at all because you did not use a digital connection hence vista is attempting to stream the audio through a connection that does not exist at all
DD and DTS decode should work with the same settings you use under XP. That is in the Entertainment Mode set DD and DTS bitstream out to OFF (use built-in decoder) and in the DVD player software set output to SPDIF (without any effects). This should route the digital audio from your DVD movies to the built-in decoder which, when decoded will be output through your default speakers (the anlogue one) without having you to change your default output device to SPDIF (in vista's playback device settings)

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