Z.Vex Mastotron

First off, I use the Mastotron with an analogue synth so my experience might not be fully relevant for any guitarists reading this.

After settling on some essential time-based effects, I decided to invest in some dirt. I toyed around with a ProCo RAT for a while but it was too noisy and the controls weren't exactly to my liking. So I started shopping around again and eventually went with the Mastotron, the rationale being that it had an impedance control (manufacturers take note), was reasonably priced, and came from Z.Vex, who have a reputation for unique designs with a twist.

I'd seen the photos of course but was still surprised by how small the enclosure actually is; imagine Digitech's new line of pedals, only this one's laid out horizontally, is shorter, lighter, and takes batteries - the Mastotron even ships with one. It's probably going to last you a while too because the draw is a mere 1-ish mA. The knobs have a pleasant resistance to them, while on the bottom you'll find rubbery feet on each corner.

Not only does the pedal look sexy, it also delivers soundwise. This thing can make my synth sing or growl (or crackle if I dial in some white noise)! I almost can't get a bad sound of it. There are plenty of knobs to tweak, which some might find intimidating yet is second nature to me as a synth player. From left to right you've got Volume (output volume), Tone (treble), Pulse Width (hard to describe, you'll have to experiment), Fuzz (amount of dirt), Relax-Push (impedance control although it can do more). My current settings are 10, 3, 10, 4, 10 o'clock. Then there's the invaluable Subs toggle which lets you alternate between three different stages of low end presence. I tend to use 3 the most because it retains my dry tone better but in a band setting with a bassist I can see myself switching to 1 more often.

The Subs switch is a bit difficult to reach spontaneously, which is about the only complaint I have. That and maybe a dry-wet blend knob in the future but that's neither here nor there I guess.

In short, this thing works wonders on an analogue synth. It's accessible price-wise, has vast tone-shaping capabilities, and is small enough to fit wherever.

I bought the Mastotron about two years ago after doing a little research on Youtube on fuzz pedals for electric guitars. I wanted to get a pedal that could do vintage Hendrix like fuzz distortion but also heavy distorted sounds associated with Stoner Rock, Sludge and so on. The Mastotron can do all those things!

It features four knobs to control volume, tone, pulse width and fuzz. You can get a lot of different sounds out of this pedal. For example, if you turn the pulse width all the way up and add a some fuzz the sound of your guitar will remind you of 8-bit chiptune music. There is also a relax-push knob to adjust the Mastotron to the amount of output from your pickups. I can easily switch between my Strat with single coils for bluesy stuff to my Ibanez RG with active humbuckers for heavier tones.

And the best thing: since I also play the bass it's just like the much more expensive Wooly Mammoth fuzz for bass guitars. It doesn't really lack any low end and sounds just great. I really like it's sound combined with a wah pedal.

Besides that, the Mastotron is a sturdy pedal. After two years the knobs are a little hard to read, but that's not really a problem. HOWEVER, I really hate that the power input is placed just a few millimeters away from the input jack. That means that i can't turn the input cable any way i want to which can be really inconvenient when setting up a pedalboard. But that's just nitpicking, I highly recommend getting the Mastotron both to guitar and bass players.

I was hoping this can get me shin-ei type sounds… now when i have shin-ei i can see it is just different, but mastotron is great:
1) really thick and unique fuzz sound, i have the controls just on the edge of that velcro effect
2) try stacking this with everything: big muff+zvex, octave down + zvex, all overdrives+zvex etc. This is one of those pedals that can stack with everything because
3) it is noiseless. I think this velcro magic cleans the feedback. Sometimes you want your guitar to feedback, but sometimes you want some thick and unique heavy fuzz that is silent when you don’t play

This definitely stays on my board, major respect for zvex

Since my old Big Muff Fuzz Pedal is giving me problems lately, i decided to try out the Z.Vex Mastotron after reading a couple reviews and watching some videos on Youtube.

What can i say? It´s a nice, quality piece of gear. It has a nice sturdy feel to it, the switches and knobs appear very well made.

I like it a lot already and while i didn´t have the chance yet to try but four or five different settings, i already found "my sound" that i need in the band as well as two other settings i like. I´m sure there´s more to come once i really have time to put it through it´s pace.

But for now, i´m a happy camper. It does what i need it to do and i´m pretty sure it´s gonna do it´s job for a long time, considering how well it seems to be made.

I can´t help but give it 5 stars in all categories. :-)

Very versatile pedal, could get practically every fuzz sound i wanted.
The subs toggle switch helps a lot with amout of low end you want to get, the most bassy one is my favorite one and it makes your guitar sound huge. (the only problem is the placement of that switch, would be hard to switch it if have big fingers, but personally i switch it with a guitar pick so it's not a big deal)
Also enjoyed the pulse width knob, it completely changes the sound you can get standard fuzz sound and synthetic kind of stuttering sounds (maybe a bit like a synth) with it and everything in between. knobs are very sensitive so there's great amount of various sound you can get from it everytime you roll it.
One of the setting i found by rolling the knobs is when you play softly you can't really tell that there's fuzz on you just feel some color added to the sound and low end and when you start playing harder the fuzz sound is manifesting.