Graal doesn't have the capacity(at least script-wise) to tune out sounds. Most sounds are played from the ganis, and such the client itself decides to play the sound when the ganis are played. They're not generated via any sort of script, so I can't tell it NOT to play a sound. Trust me, I really, really hate the sound of the water splashing and actually took measures to make it a little less annoying(slowing the pace of it while swimming, turning its effect down a bit).