EarthQuaker Devices Data Corrupter Review

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Last modified:February 17, 2018



The mad scientists in Akron have done it again. The Data Corrupter is one of the latest offerings from Earthquaker Devices and is likely to help you get started on that Summer home improvement by peeling the paint off all your walls. Earthquaker Devices have created their own spin on the familiar PLL-style pedal loosely based on the Electrax Sythax and the “Basic Frequency Synthesizer” by Ray Marston, only with better tracking and sustain. The Data Corrupter is an incredible fuzz / modulation / octave / oscillator machine that is sure to corrupt everything you feed into it, and it will destroy everything in its path.


Wait. What does this thing even do?

According to the manual, The Data Corrupter is an analog PLL harmonizer with modulation that takes your input signal and brutally amplifies it into a crushing square wave fuzz, multiplies it, divides it, then modulates it into a three-voice synthesizer. Need I go on? They pretty much had me at “brutally amplifies…”. At the heart of this signal destroyer is the Master Oscillator. The three-position switch on the oscillator control feeds your input into either Unison, -1 Octave, or -2 Octave. Use this to fine tune the tracking response for your preferred instrument. From here, the Data Corrupter will do the science and split off a synthesized frequency. Further controls allow you to select the octave/interval as well as the volume of this voice. The Frequency Modulator applies pitch-bend modulation to the Master Oscillator. A Glide Mode gives you a smooth portamento as each note slides into the next. In Vibrato Mode, the pitch modulates up and down in a retro sci-fi effect! The Subharmonic assimilates the input into one of eight lower octave programs between one and three octaves below the input. The Square Control blends in a great sounding square wave fuzz which I thought sounded great on its own!

Those not familiar with a PLL (Phase Locked Loop) will be surprised by how interesting and finicky these things can be! A PLL takes your input signal and compares its phase and frequency against an oscillator, generates an output proportional to their difference then feeds it back into the oscillator. This causes the oscillator to lock onto the input signal and generate a synthesized frequency. Serious science going on here. So what does that sound like? Well, it’s a super thick, nasty undertone with funky octaves and harmonics all over the place. Tracking inconsistencies will make things feels pretty loose and random as you noodle around the fretboard.




Control Surface:

Obviously, there is a LOT going on here. Thankfully, the control surface of the pedal is nicely arranged so you can just get down to business. It’s divided up into sections where you can kind of focus on one part at a time.

Master Oscillator. This part is the heart of the entire device.

• One small three-position switch gives you Root Control:

2. -1
3. -2

• An eight-position rotary allows for octave/interval control with options for:

1. U/U
2. +1/U
3. +1/5
4. +2/U
5. +2/M3
6. +2/5
7. +2/m7
8. +3/U

Frequency Modulator.

• One toggle gives you control between:

1. Glide
2. Vibrato

• A knob to set the rate

Subharmonic section. This section is very similar in control to the Master Oscillator.

• A small toggle for root source:

1. Unison
2. Master Oscillator

• An eight-position rotary allows for another batch of octave/interval options:

1. -1/U
2. -1/5
3. -2/U
4. -2/M3
5. -2/5
6. -2/m7
7. -3/U
8. -3/M2

A three-knob Voice Mixer section allows you to blend in:

1. Square
2. Subharmonic
3. Oscillator

And you can blend each voice in one at a time. A must-have option for any crazy pedal.

Lastly, there’s a Master Volume for the entire thing. If you’re looking for a seriously loud-ass pedal, this is the one. I found unity gain to the dry signal to WELL below noon. In fact, it’s below 9:00.

Ins and outs:

The Data Corrupter has top-mounted (!) mono 1M input and 1K output jacks and a 9v power jack drawing 25mA.


Designed and built in the USA
Measures 5.65″ x 4.75″ x 2.25″ with knobs
True bypass and uses electronic relay based switching

Visit EarthQuaker Devices for more info about the Data Corrupter.



Data Corruption further explained:

Now, if everything up to this point has made about as much sense as a midnight Trump tweet, have no fear, I will break this down for you. In a nutshell, the Data Corrupter is here to kick ass and chew bubble gum, and it’s all out of bubble gum. Unless you’re some kind of math genius or an expert on PLL-based pedals, you might plug into this thing and feel like the world just ended. You might feel overwhelmed and maybe even question why you picked this thing up. My advice… start small and work your way up. I recommend starting out with trying each of the three Voice options one at a time. Try the fuzz first. Just tear into it. The fuzz all by itself is damn near worth the entire price of this pedal. Now try playing just the Oscillator Voice. Get familiar with it. The Oscillator lets you drop (in octaves) the input source pitch. Since some of the frequencies of the Oscillator are too high for our human ears, this comes in super handy. Personally, I like the -2 option here. From there your signal is fed into the PLL and multiplied to create one of 8 different intervals. Stay with me now. In the section above, I wrote all this out for your brain to freeze up on like you’d had too much frozen yogurt. For the 8-position knob, don’t look at all the stuff printed there. JUST LISTEN. Trust your ears to do the work. Just find the setting that you think sounds the best. One end is higher pitched, the other end is lower pitched. I tend to prefer lower, in general, but since this has two voicings (in addition to the fuzz) I set a high one AND a lower one. The high one I usually mix quieter than the lower one.

Now, let’s turn that Voice all the way down and mess with the Subharmonic. Same thing here, kinda. You have two options for where that signal is coming from. You have Unison or Master Oscillator. When you choose Master Oscillator, the subharmonic will be a division of the Master Oscillator. What? It just means it gets more complicated. I prefer pulling from Unison. When you do that, it will be a division of the fuzz tone and Frequency Modulation will be taken out of the equation. Wait, what’s the Frequency Modulation? That’s the little section in the middle of the pedal that you can add to the Master Oscillator. You have two options here. Glide and Vibrato. I prefer glide for more of a subtle effect. Vibrato is cool with rate set way high for a laser machine gun effect.

Now back to that Subharmonic. Here you have another 8-position rotary giving you more options of how the signal is divided. Again, don’t read the little letters and numbers printed on the pedal. Just use your ears again and turn it until it sounds best (or worst, depending on what you’re doing). Ok. Still with me? You have it all set up now. Now you can start blending all the voices together. You can decide if you want the sound to be clean or dirty. If you’re after clean, just keep the Fuzz voice all the way down. If you’re after the nasty, just turn that fuzz up! Now mix in that Oscillator and/or Subharmonic. I suggest, for most applications, keeping these relatively low in the mix. Generally, for most usable, real-life situations, you’re gonna want to just use these to flavor your fuzz/clean tone. If they are up too high, they will dominate your signal. Now, this may be exactly what you’re looking for. If so, go for it. But that’s a really difficult beast to tame! You may find that you’ll just surrender to it and let it decide what notes pass through. It really comes down to a question of control. Do you want to be in control, or do you want to give that up to the greatest corrupter of all data?



Guitars, keys, and drums, oh my!

Seems like the obvious instrument with guitar effects is, well, the guitar. I obviously ran a series of guitars into this thing. I felt like humbuckers tracked a little better than single coils, especially on the neck pickup. Also, since the pedal is monophonic, single notes sounded better than chords. Power chords sounded better than more complicated chords. Liking what I heard, I decided to continue on to the next instruments in the studio. I have this old KORG CX-3. It’s kind of a Hammond clone and has a wide range of beautiful organ tones. Well, the Data Corrupter absolutely destroyed it. It was really fun to hear an old familiar tone get taken to the cleaners. The coolest thing is the ability to blend, just mixing in a hint of the dirty, crazy, and interesting tones that the Data Corrupter produced. It was also fun to run some old drum machine patterns into it. Imagine the coolest Nine Inch Nails drum track if it were played through the console on the Mother Ship in the original Alien movie. That’s what the Data Corrupter did for me, and all I had to do was plug into this box. I kinda think I liked drums the best. It’s as if the pedal was secretly made just for that purpose. Pretty sure drums and a DC will meet again in my studio!

Probably asking too much here, but there are a few things that would have made it so you could get a lot more from this pedal. I would have liked to have seen MIDI, or some way to save some presets. With a pedal this complex, when you find a cool sound, you’d love a way to save and recall that! Even just a few on-board presets slots would have been cool. Expression would be super fun. It sounds pretty cool to cycle through the rotary switches by hand. It might be complicated to assign a rotary to expression, but it would be cool. Even just using expression to blend in the wet signals of each of the three voices would be rad. It also seems like it could benefit from a little bit better tracking accuracy. I know that this is a characteristic of PLL effects and they, generally, feel a bit “wonky.” But as I played there were moments where a tighter feel would have been really nice.



The EarthQuaker Devices Data Corrupter will give you some of the most bizarre and beautifully intense fuzz tones and chaotic guitar sounds you will ever hear. If you’re getting sick and tired of so many fuzz pedals out there that sound just like everything else, this pedal may be your answer. You really can get as tame or as insane as you like with the blend controls. This pedal truly is a new spin on an old idea and one of the most accessible takes on a PLL pedal, being thoughtfully designed and nicely laid out in a way that makes sense for the first time PLL user. And LOUD? You damn right. At times you will think you have found fuzz Nirvana, other times you will think you smell smoke emitting from your speaker cabinet. Still, you must go on and explore the new world of fuzz that is laid out before you. Great rewards will arise from your efforts. (Ear plugs sold separately.)

That concludes our EarthQuaker Devices Data Corrupter review. Thanks for reading.


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