On the NPR show “Fresh Air” Dave Davies interviews voice actor Billy West. West’s voice credits include Bugs Bunny, Elmer Fudd, Ren, Stimpy, Doug, and Popeye. The interview runs around 30 minutes, and covers ground ranging from the genesis of certain voices to the challenge of doing multiple characters on Futurama:
It happens mostly in real time. Like if there’s a run within an act and there is, say, three characters involved that I do, and then there are some others that other people do, I’ll just keep reading through the script — one character, and then if another one pops up, I’ll do that in real time. We try to get a whole scene done, so I shift gears a lot.
West also shares the secret of nailing the Popeye voice, which has to do with emulating dual-toned Tuvan singers (skip to 17:00 on the audio, found by clicking “Listen to the story” at the top of the article page).