Wow, thanks for all the really good replies, everyone. To tell you the truth, I hadn't actually really expected anyone would be able to help me - but it seems there's some people that are really deep into it!
DrolPiraat, hang on, nobody knows
how to take the objects, but it
can be done with the 3D Ripper DX? I'm a little confused; what does the Ripper do? Does it take images of the 3D object, or does it take the actual object?
Well, I hadn't ever expected this to be easy - after all, it's not mine, and it's protected, and I can see why - to stop people like me from doing what I'm trying to do!

But in all honesty I'm not trying to do anyone any harm, unlike... other... people who might use these same resources.
Wow, that's a lot of instruments to figure out... So the first set of stuff is the actual keyboards and synthesizers, which means that I'd have to find one or find some sample sounds of them to see if they contain any of the instruments he used... tedious, although I'd rather believe he used only one, since all, and I really mean
all Rayman 2 music used the same instruments. There's only one song I can think of that used an instrument that wasn't used for any of the other songs, and that's the Crow's Nest theme, for it had an electric guitar which wasn't used anywhere else.
Anyway, enough gabble. Thank you very much, this completely narrows down all the possibilites in the world to a relative small amount of possibilities. Also, I did actually find out the organ-like sound was a Hammond myself. Funny to see that on the list as it confirms my suspicion!

Ah, yes, the virtual instruments, I had already noted them in his music. For anyone interested, listen carefully to the ending to the Crow's Nest cinematic - the one after you beat the final boss. You will hear some effects there. Also, try listening to a Henchman Theme (doesn't matter which); you will hear a small beeping noise, as one example of virtual instrument - however, there are many more and far better examples out there.
And of course I will tell you what it is after I've found it out - I love this community mainly for its nice people, but also for its many resources, and it is only fair to contribute to those resources after taking so many with me myself.
Hmm... the textures problem sounds like a bit of a bummer. I could really use the original textures either as inspiration or for use... anyway, you seem to have ripped some from the ORIGINAL original game - as I recall the N64 version came before the PC one, right? Tell me one thing, are they really low in quality, are they okay, or are they really good quality but have they been modified by the N64 so it could handle it better? I know that in Rayman 2 for the PC, the textures are a reaaaally good quality, but that that only comes out when you 'resolution hack' your game (try the RayWiki and search for that, folks - it will blow your mind how beautiful the game is with it - especially for its time).
Alright, and I've said this many times before already, but really:
Thanks a lot!
EDIT:
PS
Whoops I guess I went on a writing rampage there... sorry for the large post if that disturbes anyone.
EDITII:
Okay I really should have done this before replying, but I guess I was a little bit too exited. I read that the 3D Ripper will be able to export stuff to 3DS Max and Maya, but is it also capable of exporting stuff to other 3D programs?
EDITIII:
Okay sorry, last edit - just tried the 3D Ripper; it doesn't seem to want to run my Rayman 2 game. So I guess I won't be using that ripper then...