Kuassa Efektor WF3607 Wah FilterIn the 1920s guitar players were fascinated by the wa wa wa sound made by trumpet players by opening and closing their mutes. Its filtering effect alters the resonance of the instrument and it feels to increase the funky expressiveness of guitar playing. More than 40 years later, an accidental invention resulted in a device that forever changes the sound of guitar. This pedal eventually known as the Cry Baby*. Next, in the 1970s, an aborted