Passthrough /w Xine and Mplayer

[servo888]

I can't get passthrough working... I have a hercules cs46xx game theater xp, with optical out, which is connected to my ads-2000 midiland receiver. I can play music, and 2 channel movies just fine through the optical, but when I try to use passthrough I just get some clicking, popping, and silence. The receiver doesn't even switch over to ac3. Any help would be loved, I've been fighting this for several days and am really getting pissed off.

Some specs...
ALSA 1.0.8
cs46xx /w new-dsp code
2.6.11.7 kernel

I've searched and googled around for this issue, but haven't found answers. Mplayer and Xine both have the same issue.
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