We’ve come a long way from the days when certain silent movie actors couldn’t keep their careers alive after the arrival of talkies because their voices just didn’t work. But is it possible that some of our favorite actors really do have awful voices and are simply dubbed over to sound more appealing? That’s the premise of one of NBC’s “Red Nose Day” comedy sketches, featuring Julia Roberts, Hugh Grant, Daniel Craig and Liam Neeson admitting that their voices are very different from what moviegoers have come to expect.