The FruitFX Pedals Melon Cube is a synth fuzz pedal: a fuzz that converts the guitar's signal into a square wave, a circuit type more commonly found in synthesizers than on a pedalboard. Pedal of the Day, reviewing it in December 2025, described the effect as turning the guitar into a square wave, producing sounds from thick walls of fuzz to old school video game style leads1. Delicious Audio, covering the pedal's launch, called it a pulse-width modulator (PWM) for guitar2.
What it is
Both reviewers place the Melon Cube in the same category from different angles. Pedal of the Day wrote that "the correct term for this is a pulse width modulator (PWM)", describing it as a blend of synthesizer and fuzz1. Delicious Audio likewise reported that it "functions as a pulse-width modulator (PWM), a circuit more commonly associated with synthesizers"2. For a player, that means the pedal is not a conventional distortion or overdrive style gain stage: it reshapes the signal into a square wave, and the knobs then shape that wave and how it decays. It sits in the wider family of fuzz pedals while reaching toward synth pedal territory.
Pedal of the Day's reviewer also felt the pedal stood out in a crowded field: "you gotta create something that stands out above all the usual stuff", the reviewer wrote in introducing the Melon Cube, judging that it does so both sonically and aesthetically1.
The five knobs
The Melon Cube carries five knobs. Pedal of the Day summed them up by saying "the five knobs here work together to produce a million different sounds"1.
| Knob | What it does |
|---|---|
| Shape | Governs the width of the square wave, the core parameter defining its harmonic character2 |
| Juice | Acts as a voltage starve, allowing the effect to collapse into a more conventional fuzz texture2 |
| Gate | Signal gating; creates short bursts of sound with dead silence on the other end12 |
| Tone | Standard tone control; described by Pedal of the Day as smooth12 |
| Level | Standard level control2 |
Shape and Juice are the pair that define the pedal's character. Shape sets the square wave's width, which Delicious Audio called the core parameter defining its harmonic character, while Juice starves the circuit of voltage so the effect can fall back into a more conventional fuzz2. Pedal of the Day found the two work well together: "The Shape and Juice knobs work well together, too, letting you jump into a deep sonic rabbit hole"1.
The Gate is the other distinctive control. "The Gate functionality here is awesome, giving you the ability to create short bursts of sound with dead silence on the other end", Pedal of the Day's reviewer wrote1. That makes the pedal usable for choppy, rhythmic parts as well as sustained fuzz walls.
Where it sits in FruitFX's range
The Melon Cube has since spawned a companion pedal. In May 2026, Pedal of the Day reviewed the Space Cube Phase Locked Loop (PLL) Fuzz, describing it as "a spin-off of FruitFX Pedals' best-selling pedal (the Melon Cube Synth Fuzz)"3. Players interested in the Melon Cube's square wave approach may want to compare the two.
Videos
FruitFX
Working Class Music
Pedal of the Day
Sources (3)
- FruitFX Pedals Melon Cube Synth Fuzz, Pedal of the Day, 2025-12-13
- New Pedal: FruitFX Pedals Melon Cube Synth Fuzz, Delicious Audio, 2025-12-16
- FruitFX Pedals Space Cube Phase Locked Loop (PLL) Fuzz, Pedal of the Day, 2026-05-19
