The Electro-Harmonix Voice Box vocal harmony processor/vocoder makes it easy to get a variety of cool vocal effects and multiple harmonies, effortlessly! The Voice Box lets you generate 2- and 4-part vocal harmonies by keying off of your guitar or keyboard. You can blend effects, add the onboard reverb, and even dial in "male" or "female" formants to your liking. You get nine presets with a dedicated footswitch, plus a mic bypass switch, too. Why let the instruments have all the fun? Get creative with your vocals and plug in the Voice Box!