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CNN notes about soul calibur audio mod:
Stereo -> Mono
to get it to fit on the disk, thru a slightly original method. SC has 2 raw pcm files for each background track, a left and a right one. The 2 were merged, and named according to the left channel. Then the right
channel was replaced by a 0 byte file  (our paranoid cracker, to prevent any trouble from any file references he probably didnt miss) and then the 1st_read.bin patched with a hex editor to change all references from the right channel to the left channel. The result? More than enough space to selfboot and put in a dummy file for faster loading, without losing any movies and pleasantly enough increasing sound quality.

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DCRES notes about soul calibur audio mod: 
Left and right channel of music are on separated files in this game. In CD-R, Dreamcast can't read the data fast enough so music plays with terrible pauses. That was the main failure on first releases of this game. Well, I thought that maybe if I force audio data to end of the disc (where Dreamcast reads faster) the game could stream data fast enough. Pauses got a little better, but they were still there, annoying as always. So I had to use a trick I read around on internet. Some smart person had the idea of changing references of right channel file to left channel. So game would play both channels using the same file. It means that streaming from the same file, reading speed would be enough. Pretty clever, right? The problem about this "fix", beside making music mono, is that people usually delete right channel references (deleting its files), and replace for left channel. It means that audio of left channel is played on both speakers. It's not a true mono process because you cut whole right channel away, what makes sound weird. For example, imagine a simple stereo sound of 20 seconds, with 2 drums. First drum plays 10 seconds, and its sound comes only on left speaker. Second drum plays the last 10 seconds, and its sound comes only on right speaker. Okay, now imagine that we use this "fix" process on this sound, making right speaker plays left speaker sound, and ripping right speaker data. Did we monoized the sound correctly? See, in first 10 seconds, you'll hear first drum on both speakers. In last 10 seconds, you'll hear a complete silence, because it was the sound of the second drum that played only on right channel, and we ripped it. So what I did in Soul Calibur? I used this "fix", but instead of keeping left channel file and deleting right channel, I remade the left channel. For that I reconstructed the stereo sound using both files, and used a real monoizing process. Quality of music must be better than other releases, because music has no right speaker data loss. And yes, it's still mono, too bad, but there was no way to keep it stereo. Last comment, this process was only made on the 16 bits sounds. The lower bitrate sounds were kept intact, with their references, what make them stereo. I didn't changed them because I imagined they could be streamed fast enough (lower bitrate), and well, I noticed no problem with that so I think I was right. In fact, there is a little, very little sound bug that might come from this. When you enter mission screen, the sound of menu popping up plays more than once. But it only happens when you enter mission screen, and it's not annoying anyway, so you'll have to live with that.