Cool Boarders 2 isn't copy protected, The Black; it's Cool Boarders 2001 that is, so you probably won't be able to find a patch, and if you do, it'll only be a trainer or a PAL/NTSC converter, neither of which will make any difference to the sounds.
If you're playing from the original CD, then it's probably a compatibility problem with the game, which makes a report all the more useful - that's how the emulator gets improved. One other thing you could try, though, is starting pSX with the -r switch.