I've read that Chester damaged ( scratched ) his phonetics hords in the past because
he used to be addicted to cocaine ( and also Crystal Meth ), and one day when he went to the hospital the doctors said that he had damaged his voice. And it may be coincidence, but I notice that from 2004 till today his voice becomes softer and softer . . . . . This could be what makes the difference. . . .. I don't mean that we should start taking drugs in any way, in addition chester is blessed with this voice