You need to install LibShifterBox in order to make this work!
But after that you are able to select the sounds at the bottom of the settings of FCOChangeStuff.
Left list shows all available sounds. Right list you can add sounds which should not play any sound anymore.
Clicking the list entries will play their sound. Not all sounds actually provide a playable sound so do not wonder if some are just doing nothing.
All sounds you have added to the right will be silent ingame as long as FCOChangeStuff is loaded AND the checkbox to disable some sounds is activated above the shift box.