Walrus Audio Warhorn Mid Range Overdrive Guitar Effect Pedal. The item “Walrus Audio Warhorn Mid Range Overdrive Guitar Effect Pedal” is in sale since Sunday, August 30, 2020. This item is in the category “Musical Instruments & Gear\Guitars & Basses\Parts & Accessories\Effects Pedals\Distortion & Overdrive”. The seller is “mikelee202084″ and is located in Clayton, North Carolina. This item can be shipped to United States.