Mass Effect 3 audio lead Rob Blake is at the helm of a new four-and-a-half-minute video on GameInformer, during which he takes us through the various processes the team has experimented with while morphing D.C. Douglas' voice acting with the Geth synthesized "clickiness" in order to lend a voice to Mass Effect 2's Legion.
Legion will be returning as a companion in ME3, too, but only if he/she/it lived through the suicide mission at the conclusion of ME2.