Can't you just disable the audio options on your computer while you're playing, if it's so annoying?
Well just speaking for me personally, I
loathe the CAS and build/buy music but I like the stereo music and would like to find a way to keep it without the other and having to switch music on and off all the time.
I think the OP was talking about the little tunes for finishing a repair job, completing a painting, first kiss, fulfilling a want bla bla. Those don't go away if you shut music off, I think they can only be muted if you mute all the audio.
Now I imagine they are in some audio file somewhere and if they were easily accessible could be switched out for new ones and blank ones, but they aren't mp3s as far as I know and I don't know if anyone has figured out the audio format and how to access it yet.