Diamondz,
the op is trying to kill the sound of the clones.
He is trying to figure out how to do it.
I would guess that, yes, you have to go to the sound options of each of your clones and turn everything off.
But, there are different factors that you will have to consider, are you software boxing? hardware? and if software, then, are you using different wow folders for your toons. or are they all pulled up from the one folder?
I believe that if your using one folder to run all your screens then you will have to do it all the time after you closed the windows. try it out see what works.
so, thats that. :P