Indeed, it's different because Madworld isn't a Radical Entertainment game and vgmstream only supports those. Madworld RSD support will hopefully be added soon.
Yep, it's a different format. I've been looking at it. The body is DSP but the header is encrypted, I think. Sadly this means that we have to decrypt it for the sake of the coefficient tables. Been poking around trying to figure it out; I've downloaded the whole game so I'll have all the files I need. For what little it's worth, I think the "RS" in "RSD" here stands for "RedSpark".
I, too, am dabbling in MadWorld files with an .iso I have. hcs, thanks so much to your Winamp plugin, I was able to read the exact same audio in your zip files you posted. All that audio is from the cutscenes, but I was looking to go a bit further and get audio that occurs throughout the game, specifically in the "announce" folder in the .iso.
This may be a little OT since the files are in .bin format, but can anyone think of a way to get at this audio? The usual "mount the image file" doesn't seem to work.
I think the other audio I looked at were packed into simple vfses. Those can probably be handled the same way as the .rsds, but I didn't look into them because I was only interested in the music.
When HCS mentioned vfses, he wasn't talking about an audio format, he was talking about a Virtual File System. One way to look at ii is that the files HCS is talking about are inside a ZIP file. While that's certainly not the case, what I mean is that one of these files (the BIN files I would assume) contains information about a bunch of files stored inside it (similar to a ZIP which contains many files, and sometimes folders, inside it). And of course you can't mount the BIN files. They're not an image file. They might be (probably are) a VFS, but that's entirely different from a CD/DVD/etc. image file.
Take a look at it in a HEX editor. You'll have better luck with that most likely. Mouser X over and out.