Trying to get into ripping? Nice!

I remember that the main BF file had a .DSC file that came along with it and stored the offsets and sizes of all files in the BF file, but I don't remember if the music BF came with one or not. If it has one, you should first extract the individual files or you'll be stuck with one big clunky wav file in the end.
As for the format, it's not PCM, but PS2 ADPCM. You need to create a genh file for it using VGMToolbox before you can convert it to PCM using VGMStream.
It'll ask you for the format (PS2 ADPCM), the sample rate and channels, and the interleave. I think the interleave was 0x10 but it's a long time ago so I'm probably wrong.
I hope that helps! If it doesn't, I'll look at the files and refresh my memory on the process
