Thank you for viewing! Limited-time campaign now underway! We are selling new display items at special prices. Revol effect WHITE OWL BOOST ECB-01 This is a one-knob booster. With its simple usability, connecting it to an acoustic-electric guitar with only a microphone, will produce a clearer sound. Please take advantage of this opportunity. 1-6-9 Fuchu-cho, Izumi-shi, Osaka Shin Nihon Music Co., Ltd. JR Hanwa Line, Izumi-Fuchu Station Shopping Street