In this official Ableton Live video, Huston Singletary demonstrates vocoding with the Ableton Vocoder.

Vocoders use a multiband filter to apply the amplitude of various frequencies of a source sound, such as your voice, to another sound. Vocoders are probably best known from the voice of the Cylons on Battlestar Galactica and other sci fi robots.

Ableton Live Vocoder Tutorial, II