There's an emulation issue in likely every USF set due to Project64 being used as the basis for the winamp plugin, and it having said error(apparently up through 1.7 versions). The tempo, or speed at which the notes are played, is wrong in the emulators as well as the USF sets.
If it took a bunch of N64 nuts from 1.4 through 1.7 to figure out how to fix the problem, I'm not holding my breath on getting the info on my own.
The best bet would be for hcs to ask zilmar about such issues.
zilmar doesn't exactly trust me: Mainly due to me cracking the alpha versions and then adding insult to injury by inline patching them (keeping UPX intact, whereas DigitalSpider does the lame approach of unpacking then cracking :/)
odd I just tried downloading them again on a different connection (before I tried dta, regular firefox, opera, and ie and everything yielded a 566KiB file that would not open) at any rate, the shit on the site will be updated as soon as I can find my ftp password or if/when hcs does it