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    ZVEX Effects Mastotron Fuzz FX Pedal

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    The Mastotron from ZVEX Effects is a heavy silicon fuzz with a few extra tricks up it's sleeve, and part of the ZVEX Vextron series.  It's works equally well with guitar, bass and keyboards, but it totally kills it with bass!  The Mastotron has a few cool and unusual features too. 

    ZVEX Effects are one of the original and best known boutique pedal brands out there, setting the benchmark with their beautifully designed and ultra creative range of FX pedals


    The Details
    • Effect: Fuzz
    • Made In the USA
    • Works equally well with guitar, bass and keyboards
    • Part of the Vextron series
    • Totally kills it on bass!
    • Flexible and Heavy silicon based fuzz
    • Pulse width control
    • Soften input impedance for active pickups with 'Relax/Push'
    • Great for re-amping bass tracks
    • 9VDC power center negative
    • Also Runs on 9V battery
    • 1 year manufactuer warrenty



    • Free UK shipping from orders of £200 or more
    • Orders despatched within 1-2 working days
    • Always tracked worldwide shipping
    • Plastic free packaging as standard


    30 day peace of mind return policy, but please read our terms and conditions, returns and refunds policy before placing an order. 

    What Do ZVEX Effects Say?

    A sub-heavy silicon fuzz with some new twists: An input impedance control (push/relax) that adjusts from passive pickups to line level. It works very well for re-amping bass tracks that need to be fuzzed up after tracking and keyboards. There’s also a three-position sub control switch, a treble tone control, adjustable pulse width, and a wide fuzz depth control. More flexible than any silicon fuzz to date.


    This knob introduces source impedance to the signal going into
    the Mastotron™. When fully up, the signal goes in raw...when turned down, source impedance is added as needed to “soften” the input for active pickups.

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

    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!