I just want to know how to make a wavebank, since my list will probably involve quite a lot of running around and recording audio in random parts of levels (take for example, I want Hell to be a certain area in the game, then have WoF music be the more "hyped up" version of Soul Sanctum that was used for the boss of that area), and there aren't enough soundtracks for every area of the game currently. It seems like a better option given that you want to play it, but haven't, since being spoiled (as you may know) really ruins the game, and I want to make sure that you (unlike me, since I check game wikis way too often) get the most enjoyment out of the experience.
It really is a great game, by the way, and I personally recommend picking up the soundtrack bundle once Steam sale comes up.