You're probably thinking of something I did a while ago.
http://forums.thetechnodrome.com/showthread.php?t=39646
What happened was that some Russian DVD company got music-and-effects mixes for the first 22 episodes (probably for dubbing) and made a fake 5.1 track for those episodes, with the M&E in the two front channels. Not perfect but nevertheless really great for grabbing some nice music.