The O’Reilly Digital Media Center has a fun how to on making Cylon-y sounding voices – “You’ve heard their smoothly sexy yet alien voices. Vocoders are devices that make ordinary sounds sing or speak recognizable words. In this hands-on tutorial, Jim Aikin explains how vocoders perform their magic and how to set up your own software vocoder, and shares some unexpectedly cool uses for vocoding.” – Link. The sound samples are great!
HOW TO – Make your sound sing with Vocoders