Replace your vocal chords with a cybered voice box. This allows you to perfectly imitate voices and to control your volume of speech, from the softest whisper to a thunderous roar. It can also be used in combination with listeners with CyberSenses: Cyberears to encode normal speech into unrecognizable squeals or ultrasonic noise inaudible to unmodified humans.
In conjunction with a FaceDanceMask, it allows extremely good disguises.