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Zvex Wooly Mammoth
Bass Fuzz Pedal


Sensitive and touchy, This bass fuzz has tremendous bottom end and a beautiful harmonic structure that sounds blistering with a guitar too. Finally, bass players can be as grizzled and huge sounding as their ego-absorbed guitar player. It ain't cheap, but great tone rarely is!

Zvex Wooly Mammoth
Bass Fuzz Pedal

  • The harmonic structure can be radically altered using the "PINCH" knob. It adjusts the pulse width of the waveform. In the leftmost position, the waveshape is quite symmetrical which produces a smooth creamy sound. Turning it up slightly introduces lovely intermodulation distortion. Turning it clockwise narrows the waveshape into asymmetrical pulses, making the tone reedier and brassier. This also introduces an unusually smooth 'gating' action, which gives you an absolutely eerie silence between notes. At most settings you will notice that low frequency pressure is preserved.
  • This circuit has a frequency response that continues several octaves below audibility. The subs will knock everything off of your amps, so put the the bottles on the floor. No kidding. The "WOOL" knob adjusts the amount of fur around the note. The "EQ" knob tilts the spectral response, turning to the left adds lows and softens the highs. Turning to the right adds highs, then mids, and finally reduces lows. the "OUT" knob Is designed for smooth repeatable level settings In their continuing effort to be friendly towards the earth, the universe and it's inhabitants; no animals were harmed during the making of this pedal.


  • The circuit (designed by Chuck Zwicky) draws less than one-half of a milliampere (0.0004 amps, typical). That is less than one-hundredth the current consumption of most 'commercial' pedals, giving this pedal about as high a battery life as you can find anywhere. In fact, if you use an alkaline battery and always unplug the input cord between sessions, you may never have to change it at all!

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Bass Fuzz Pedal
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Rainbow Reviews:

Stefin Gordon


The ZVex Wooly Mammoth is the best fuzz for bass I have ever heard. Why? The tone, brothers and sisters, the tone. After plugging this pedal in, I can understand why bassists have been parting with th ... Read More

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