ZVex Mastotron

ZVex Mastotron - Very versatile fuzz pedal for guitar and bass

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Product Description


Zvex Mastotron can get close to the sound of the legendary Woolly Mammoth. Our feeling is that Woolly Mammoth's sound is a bit more aggressive/hairy. Mastotron is very versatile and can also be used with active pickups. You can also use it with line-level signal thanks to the source impedance control (Relax/Push). Turning the Relax/Push also changes the nature of this pedal from subtle and quite natural to full-bore fuzz mayhem!

The Mastotron is a new, heavy silicon fuzz design that includes a couple of unusual features... source impedance control, subs control, and pulse width coltrol. It works equally well with bass and guitar, and can easily be interfaced with digital devices like recorders as well as keyboards.


RELAX/PUSH: This knob introduces source impedance to the signal going int the Mastotron. When fully up, the signal goes in raw... when turned sown, source impedance is added as needed to 'soften' the input for active pickups.

FUZZ: This wide-range knob lets you set just how fuzzy your Mastotron gets.

PW: Pulse Width control. You can swing this from square wave on the left to narrow pulses on the right.

TONE: This shapes the treble without sacrificing the heavy subs.

VOL: Output volume.

SUBS Switch: '2-1-3' Lets you set how much sub content is in your fuzz. It's pretty dramatic... 3 is huge, 2 is medium, and 1 is absolutely none left. Totally twinky. Try 1 with the tone turned down!


Plug your guitar (or any effect's output) into the right hand input jack. Plug the output into an amp or other effect's input. Set the amp for a warm clean tone on bypass. Turn on the pedal and rock out! Using a guitar or bass, turn the Relax/Push knob down a bit if you need to until the fuzz sounds immediate and tight. Turn the fuzz control until you're happy (Zvex likes it all the way up) and set the PQ to square (counter-clockwise). Adjust the tone for the treble amount you want, and use the sub switch on 3 for full heavy subs for bass or 2 if the subs are overloading your amp. Try turning down the Relax/Push knob all the way. Now, turn up the PW knob until it gets all the way to the pulse side. Try turning up the Relax/Push knob now. For a strange effect, set the subs switch to 1 and then turn down the tone control all the way. You'll have to turn up the volume control with this setting.


Zvex recommeds that you try the Mastotron first in your pedal chain, just after the guitar. You can set the amp for your favorite clean tone for the most blistering results, but a distorted sound can be very cool as well. Play in into your favorite distortion pedals or direct into the amp for different textures. Try putting weird effects into the Mastotron and adjust the Relax/Push knob for best interfacing.

Uses one 9V battery or a DC power jack (standard Boss configuration with center negative) is provided on the side of the pedal. The low current operation of this pedal's circuit will give you extraordinarily long battery life. Current draw is approximately 1 mA.


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