Unfortunately the only high quality stereo versions of the songs that exist are from that Koopa Loud Music Nintendo album. The songs in both F-Zero X and the Expansion Kit are mono and 20KHz or so I think. They're also streaming audio (rather than sequenced like most N64 soundtracks) so there's no chance of ripping samples or midis. It's really too bad no official soundtrack was released like F-Zero X.
I'd still love a USF set though. I have MP3s recorded from the game but they're probably even worse sounding than USFs would be (and I might not have all the songs either.)
i doubt it if expention kit uses 20khz audio, at the time they made FZX, they had limited use of the power of the N64
iam not quite sure if the N64DD expands the N64`s processing power, but wath it does have is an updated RAM, FZX uses the standart 4MB, while the expantion kit has acces to 8MB RAM
maybe they decided to double the power pure for the rendering but i boudt they really needed double the RAM for rendering since the game ran great on just 4MB
FZX`s soundtrack is in 20khz cause otherwise it would have taken to much space in the ROM
FZX expention kit is 64MB compared to the 16MB FZX is
besides that, the expention kit doesnt even contain a full game, the only thing present on the disc is 12 tracks, 2 modes and a few songs
they had more than enough space and RAM to use something like a 32khz soundtrack
Unless someones bullshitting me, some of the songs in F-Zero X Expansion Kit are played in stereo. The few videos I can find of it on Youtube, the in-game music is mostly in stereo but the menu and title are mono.
Also the streams are indeed around 20kHz or so. Atleast in F-Zero X's case.
So now I still wonder how to get N64SoundTool to extract the streams out of FZX Expansion... I also wonder if when I export it, it'll export the left and right channels separately instead of a whole stream... or something stupid happens.
I'm going to hope for the former since it's dirt easy to combine the two in Audacity.