Moc won't play DTS inside wav..
Will be glad to see some support for this kind of files.

I have the same problem, but I was able to partially solve it by changing AlsaDevice to something like "iec958". Check by "aplay -L" if you have similar device.

BTW. I have Asus Xonar DX connected by optic fiber to amp.

Maybe you can clarify what you need:
Are you looking for support in software, that is, processing DTS and creating a stereo downmix for any sound-device, or do you need to send the DTS to an actual DTS decoder (that may or may not be directly on your soundcard) ?

I have wav audio files, that contain dts.
mplayer can play them in my system, but with moc all I can hear is some noise.

mplayer output:

Forced audio codec: mad
Opening audio decoder: [libdca] DTS decoding with libdca
AUDIO: 44100 Hz, 2 ch, s16le, 1411.2 kbit/100.00% (ratio: 176400->176400)
Selected audio codec: [dts] afm: libdca (DTS-libdca)

I don't actually know what I need, just want moc to play the files :)

Seems best if moc could do both things. Even better if it could also decode dts to 5.1 channels.

Let me note, that it is also possible to put dts data into flac file (gaining ca. 10%).