[LudiusMaximus]

As I have already told you , you could try to hook PlaySound() as described here: https://www.wowinterface.com/forums/...688#post325688

I have not tried it myself, but this is how I would go about it. First you write:

hooksecurefunc("PlaySound", function(...)
  local id, channel, forceNoDuplicates, runFinishCallback = ...
  print("PlaySound", id)
end)

This should print the sound id of any sound played.
Thus, you can note down the sound ids of Shuriken Storm and Fan of Knives.

Then you make a function above your hook function:

local function StopLastSound()
  -- Play some sound to get a handle.
  local _, handle = PlaySound(SOUNDKIT[next(SOUNDKIT)], "SFX", false)
  if handle then
    -- Stop this sound and the previous.
    StopSound(handle-1)
    StopSound(handle)
  end
end

And change your hook function to

hooksecurefunc("PlaySound", function(...)
  local id = ...
  
  if id == <Fan of Knives id> then
    StopLastSound()
    PlaySound(<Shuriken Storm id>)
  end
end)