I've actually been hacking JJ2 for quite some while, really. It's mostly some experimental tools, and with them I found out some bugs that could be fixed. I'll first need to find out the offsets and do some xreffing and stuff.

And that divide-by-zero error scares me. ;(

Here's the tool that can kill sound effects: AVKill (still in preliminary, do NOT trust this!)

The above tool has been tested on a level with spike balls, but if the code is patched onto the game, the whole thing will crash a few seconds after the level loads. Oh well.
(I'm more familiar with MIPS r3k, though)

EDIT: Carp, I just can't win. JJ2's strict in checking its gameloop, so even the slightest modification sets it off:

Jazz Jackrabbit 2 has caused an access violation at 0x00 by attempting to read from address 0x00.