"now, shouldnt the 2.0 source function as dolby pro logic surround, but not dolby digital? thats still a pretty decent surround sound mix"
To answer both questions...PCM isn't really "2.0". The SW soundtrack is a matrixed stereo soundtrack. If you listen to commercial DVD's that have a DD2.0 and a PCM soundtrack (i.e Young Guns), the PCM soundtrack will sound much better when Pro-logic decoded, at least in my experience. Most DVD magazine reviews I've read about DD2.0 soundtracks describe them as sounding like "big fat mono".
I found a program that simulates a Pro-logic II decoder, and ran the LD PCM soundtrack through it. This created a 6-channel .WAV (also uncompressed, like the original PCM track.) After this, I split the 6-chan wav into 6 separate channels, creating the soundtrack that would normally be heard from a Pro-logic II receiver.
I then took these 6 separate channels (actually 5, since the low frequency effects, or ".1" sountrack, remained within the first 5 soundtracks) and created a 5.1 DD soundtrack. Now I have a 5.1 soundtrack similar to the PCM track when PLII decoded, but it takes up a fraction of the space taken up by a PCM stereo track. The more space I can devote to the video, the better.
