[Darkfalz]

Well, I'm not sure exactly what you want to accomplish, but from taking a quick look at the files, I can tell you this.

The ADX*.BIN files are regular ADX files, and contain music tracks (as well as some speech for the announcer, but no SFX).

I would assume that the sound effects are contained in the S_*.BIN files. They are probably raw ADPCM. To this day, with all my experience, I have yet to find a tool to decode these ADPCM files, although I do have one to encode them. The other files are easily identifyable as graphics.

I suppose you could swap a few of them around if you really wanted to and see what happens, but I don't really see the point.

As for changing ADX between night/day stages, I doubt it's possible. But you could search 1ST_READ.BIN for instances of each ADX and see if there are two separate ones. Other than that, it would require a live dissassembler or very good SH4 skills.