I've long considered Jones's vocal performance in Empire among the very best in cinema. The robotic overtones of the original gave way to a decidedly more human terror, his intonations deriving not from a machine but from Hell itself. There's a horribly evil reverberation to everything that comes out of that mouthpiece. (Just compare a choice bit like "I am ALTering the deal; pray I do not alter it any furrrtherrrr" to anything in ANH/ROTJ/ROTS. The delivery is bordering on the sensual.) My question: Does anyone have background information as to how Kershner, Jones and the crew fine-tuned this distinct performance?