The Dr. Scientist Frazz Dazzler is a dual-channel, aggressive fuzz pedal with a wide gain range and a full 3-band equalizer, built by the Canadian maker Dr. Scientist. A Gain footswitch toggles between a low-gain channel and a high-gain channel, and the maker says the circuit uses a unique topology that delivers extremely high gain even on the low-gain channel1.
What sets it apart from most fuzz boxes is the pair of extra tools wrapped around that gain: a variable voltage-starve system, controlled by a Volts knob, that pushes the circuit from full-headroom fuzz into glitchy, sub-octave territory, and a Mix knob that blends dry and fuzzed signal and can be swept with an expression pedal12. Dr. Scientist states that, like all its pedals, it can be used with guitar, bass, synths and many other instruments1.
What it does: two channels of fuzz
The Frazz Dazzler's core is its two gain settings. A Gain footswitch toggles between the low- and high-gain channels5. The high-gain channel offers over-the-top saturation with a built-in noise gate1, which matters here because that much gain would otherwise hiss between notes. MusicRadar's Trevor Curwen described the two settings as "low-to-medium gain and the other high gain" with the gate on the hotter setting6.
Both channels share the voltage-starve system. Dr. Scientist says a variable regulator feeds the circuit, "resulting in a range of sounds from" lower headroom with more clipping through to glitchy, sub-octave tones as the voltage drops1. Pedal of the Day's reviewer put it in player terms: the Volts knob "allows you to control the amount of voltage the circuit gets," opening up interesting gated fuzz sounds as well as massive-headroom fuzz2.
On the circuit itself, Guitar Pedal X's Stefan Karlsson describes it as "a really powerful triple OpAmp gain stage fuzz - with 4 transistors in their too!"7.
Controls
| Control | What it does |
|---|---|
| Gain | Sets the dirt level2 |
| Gain footswitch | Toggles between low- and high-gain channels5 |
| Volts | Controls how much voltage the circuit gets, from massive-headroom fuzz to gated, glitchy, sub-octave sounds12 |
| Bass | Adjusts the low frequencies5 |
| 3-band EQ | Full bass/mid/treble equalizer, "not the most common on a fuzz pedal, but extremely useful in dialing in the sound you're looking for"12 |
| Vol | Controls the overall output, for boosting or taming the signal2 |
| Mix | Blends wet and dry signals, from dry with a hint of dirt to fuzz with extra clarity26 |
The Mix knob is the feature reviewers kept coming back to. MusicRadar noted that "Add in some dry signal and there are myriad blends, from dry with a hint of dirt through to fuzz with a touch of extra clarity"6. For bass players especially, that blend is what keeps the low end present under heavy fuzz.
Expression pedal control
The Mix control can also be driven by an external expression pedal2, connected with a TRS cable using a pedal with 10kΩ to 100kΩ resistance5. Delicious Audio's buying guide describes the parallel fuzz blend being mixed in via expression pedal, with the second footswitch taking you "into blown-out speaker territory if you need it"8.
MusicRadar's verdict made this the headline feature:
"A versatile pedal anyway, but the inspired expression pedal facility puts the cherry on top."
For a player, this means you can connect an expression pedal to morph between dry and fuzzed, rather than committing to one setting6.
Power
The Frazz Dazzler runs on 9V DC with a 2.1mm center negative plug and draws 100mA5. That current draw is on the high side for an analog fuzz, so it is worth planning for on a compact power supply, and it rules out a battery.
At 100mA, the Frazz Dazzler draws more current than many small fuzz pedals. Check that the isolated output or daisy chain you use can spare it before building it into a board.
On bass
Dr. Scientist states the pedal works with guitar, bass, synths and many other instruments1. Bass Musician Magazine's Jonathan Moody reviewed it from a bassist's perspective and found it to be "a fuzz pedal that works well with all sorts of basses AND has a mix knob for your particular taste," adding that it was "sure to be used quite a bit on my pedalboard"9. The Mix knob is the key there: blending dry bass signal back under the fuzz keeps the fundamental intact.
Versions
The pedal is currently listed as the Frazz Dazzler V23, with finishes such as a Green Sparkle version documented3. The V2 carries the same core description from the maker: dual-channel, aggressive fuzz with a wide gain range, a full 3-band EQ, the noise-gated high-gain channel and the voltage-starve system3.
What reviewers said
- MusicRadar (Trevor Curwen): Called it versatile, with the expression pedal facility the highlight. Reasons to buy listed as the expression pedal connection, the choice of gain stages and versatility; the lower-gain fuzz "delivers the most practical range of tones, cleaning up nicely with guitar volume"6.
- Pedal of the Day (2017): Found the 3-band EQ extremely useful for dialing in a sound, and reported it could cover "a Big Muff-type, creamy fuzz tone" or "a giant wall of noise that doesn't muddy up and still sounds great"2.
- Bass Musician Magazine (Jonathan Moody, 2013): Recommended it for bassists, citing the Mix knob and its behavior with a range of basses9.
- Guitar Pedal X (Stefan Karlsson, 2024): Listed it among notable fuzz/distortion pedals at $219, describing the triple op-amp gain stage circuit7.
Videos
ProGuitarShopDemos
Dennis Kayzer
Ponderer Sounds
Questions
Can you use an expression pedal with the Frazz Dazzler?
Yes. The Mix knob, which blends your dry and fuzzed signals, can be controlled with an external expression pedal connected via a TRS cable with 10kΩ to 100kΩ resistance. MusicRadar's reviewer called this the pedal's highlight, letting you morph between dry and fuzzed in real time for a new range of expressiveness.
Does the Frazz Dazzler work on bass?
Yes. Dr. Scientist states that, like all its pedals, the Frazz Dazzler can be used with guitar, bass, synths and many other instruments. Bass Musician Magazine's reviewer found it works well with all sorts of basses, and the Mix knob lets you blend dry low end back in to taste.
Does the Frazz Dazzler have a noise gate?
Yes. The high-gain channel offers over-the-top saturation with a built-in noise gate, which Dr. Scientist builds into the second Gain control. MusicRadar describes the two gain settings as low-to-medium gain and high gain with a built-in gate effect.
Is the Frazz Dazzler analog?
Yes. Dr. Scientist lists the Frazz Dazzler, including the V2 version, as an analog circuit. Guitar Pedal X describes the design as a powerful triple op-amp gain stage fuzz with four transistors in the circuit as well.
What does the Volts knob on the Frazz Dazzler do?
It controls how much voltage the circuit receives. Both channels use a variable regulator for a voltage-starve system, so turning the Volts knob down moves you from full-headroom fuzz toward lower headroom, more clipping, gated fuzz and glitchy sub-octave tones.
Where is the Frazz Dazzler made?
Dr. Scientist builds and ships the Frazz Dazzler from Canada, and the maker notes that shipping from Canada takes around two weeks. The company is a Canadian effects builder whose current product pages list the pedal at an MSRP of $219 USD.
Sources (9)
- Frazz Dazzler, Dr. Scientist, 2026
- Dr. Scientist Frazz Dazzler Fuzz, Pedal of the Day, 2017-04-28
- Frazz Dazzler V2 by Dr. Scientist, RockBoard PedalPedia, 2026
- Frazz Dazzler (Green Sparkle) by Dr. Scientist, RockBoard PedalPedia, 2026
- Frazz Dazzler, Dr. Scientist, 2026
- Dr Scientist Frazz Dazzler review, MusicRadar, 2014-11-18
- Guitar Pedal X, Guitar Pedal X, 2024-08-30
- The Best Crazy, Weird, And Unusual Fuzz Pedals In 2024, Delicious Audio, 2024-10-24
- Dr. Scientist Frazz Dazzler Review, Bass Musician Magazine, 2013-05-01
