ZVex Effects Wooly Mammoth Vexter Fuzz Effects Pedal Fuzz pedal desigend for bass but fantastic for guitar too. Features a gentle gate for silencing your instrument between notes or phrases EQ control that smoothly selects between more bass and more treble. Vexter Series pedals are lower priced, featuring silk-screened art. All Z.Vex pedals use a 9V DC power supply with () polarity on the middle pin