Well, good news, there are some streamed files in here among the sfx. Download this script (and Python 2.6 if you don't have it), and run msm.py with the name of the msm file, for instance:
python msm.py MMODDR_Snd.msm
and it will write out standard dsp files for all the samples. Output names are formatted as Group#_0_Sample#.dsp
I think that the sample# is unique across groups, but this was easiest to handle. It may result in a few redundant samples.
Now your streamed music is actually stored as two separate samples. You will need to find the sets of two files with the same size and rename them to L and R for vgmstream to play them together as stereo. For instance:
0004_0_015d.dsp and 0004_0_015e.dsp are two channels of the same song. Rename these to 0004L.dsp and 0004R.dsp and play either one, vgmstream will find the other and play them as stereo.
The stereo files seem to be together in the same group, and they're the only samples in that group, so that should make them easier to handle. They are groups 4 to 22, 29, 2a, 3d and 3e, by my quick check.
Worked Perfect! Thank you so much! I'll provide a proper source for the stream thread in a while. Now to pitch in what I promised, give me 9 days and I'll post my DKR rip :)