sentences:  Animation director and producer Eric Stough also voices Kenny McCormick "un-muffled," in the few episodes where the character does not wear his trademark parka that normally muffles his voice.Throughout the show's run, the voices for toddler and kindergarten characters have been provided by various small children of the show's production staff.When voicing child characters, the voice actors speak within their normal vocal range while adding a childlike inflection.