It has 2 control Jack's that can switch channels on a guitar amp. This unit offers endless flexibility wether using it stand alone or with an amp.I've primarily used at home for recording. Works great feel free to ask questions. The item "Boss GT Pro guitar effects processor" is in sale since Thursday, July 26, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Multi-Effects". The seller is "tripple2823" and is located in Coraopolis, Pennsylvania. This item can be shipped to United States.