Running MP3 files with DS Doom

I noticed in DS Doom PRBOOM.CFG file that you can play MP3 files while playing Doom, but have to match the file names in the config file, however, it doesn't state where the MP3 files go, I have also viewed the documentation but that was also no help as well.

So anybody have any idea?

And if your wondering what cartridge I'm using for homebrew, it's the R4DS.

I'm pretty sure DS Doom can't actually play mp3 files. That was probably just left in the configuration file during the port.

Okay no problem, just thought it might have been able to on the slightest chance, but guess not :(

I know Lazy1's FPS port to the DS supports mp3 music. I just can't remember which game it was. Either Rise of the Triad or Wolfenstein DS, one of the two.