Mojo Hand FX makes the GRRRocker, a limited edition overdrive pedal developed in partnership with Girls Rock! Grand Rapids (GR!GR), a charitable collaboration announced in November 20221. Delicious Audio describes it as modeled after the Bluesbreaker circuit, with "a classic, clean overdrive with a hint of crunch"2. Guitar World calls it "a super simple Blues Breaker-like overdrive, with volume, tone and gain dials," plus a central push button that switches between hard and soft-clipping styles1.
What it does to your sound
The GRRRocker sits in the Bluesbreaker family of overdrives, circuits named after the Marshall Bluesbreaker pedal and generally used for low to medium gain tones that keep the character of the underlying amp. Mojo Hand FX adds two things on top of that basic design. The first is the central push button, which Guitar World says switches between hard and soft-clipping styles, calling it "a new tonal element"1. The second is the distortion trimmer described below.
The two publications describe the range of the pedal in similar terms. Guitar World writes that "it seems there's a surprising array of tone on offer, from booming crunch, to honeyed, harmonic drive"1. Delicious Audio's Paolo De Gregorio says "it features a classic, clean overdrive with a hint of crunch" and calls it "the perfect pedal for a new guitar player crafting their sound or for the seasoned expert looking for a smooth and straightforward overdrive"2.
The controls and the back-panel trimmer
The front panel is deliberately simple: volume, tone and gain controls2, with the clipping push button between them1. Delicious Audio sums up the layout as a straightforward interface in a small package, saying "you'll be surprised by what you get within this small package"2.
| Control | What it does |
|---|---|
| Volume | Sets the pedal's output level2 |
| Tone | Shapes the treble content of the drive2 |
| Gain | Sets the amount of overdrive2 |
| Push button | Switches between hard and soft-clipping styles1 |
Behind the back panel there is a fourth adjustment: a distortion trimmer pot. Delicious Audio says "you can further customize your sound with the distortion trimmer pot found behind the back panel"2. A trimmer is set with a screwdriver rather than a knob, so it is meant to be dialed in once and left alone, giving an internal amount of distortion beyond what the gain control reaches.
The Girls Rock! Grand Rapids limited edition
The GRRRocker exists because of a charitable partnership between Mojo Hand FX and Girls Rock! Grand Rapids, announced by Guitar World in November 20221. It is a limited edition pedal only available on Bandcamp, from the Girls Rock! Grand Rapids Bandcamp page12.
The campers also helped create the powder-coated artwork on the enclosure, which Guitar World describes as complete with characters, including doodles of ghosts, video game controllers, planets and cacti1.
The GRRRocker is a limited edition sold only through the Girls Rock! Grand Rapids Bandcamp page, not through the usual dealer network12.
Guitar World notes that the pedal carries a lifetime guarantee1.
Where it sits in the Mojo Hand FX range
The GRRRocker is one of several overdrives from Mojo Hand FX. The Mojo Hand FX Sericon is the maker's Klon-style overdrive, and the Mojo Hand FX Rock City is a dual overdrive developed from the discontinued Odessa. For a broader look at the category, see Overdrive Pedals.
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Questions
What circuit is the Mojo Hand FX GRRRocker based on?
Delicious Audio describes the GRRRocker as modeled after the Bluesbreaker circuit, and Guitar World calls it a super simple Blues Breaker-like overdrive. That places it in the family of low- to medium-gain overdrives named after the Marshall Bluesbreaker pedal. Mojo Hand FX adds its own elements on top of the basic design, including a push button that switches between hard and soft clipping styles and a distortion trimmer behind the back panel.
Where can you buy the Mojo Hand FX GRRRocker?
The GRRRocker is a limited edition pedal that Mojo Hand FX sells only through the Girls Rock! Grand Rapids Bandcamp page, according to both Guitar World and Delicious Audio. It was announced in November 2022 as part of a charitable partnership with Girls Rock! Grand Rapids, and Delicious Audio reported in February 2023 that it remained a limited edition available only on Bandcamp.
What does the distortion trimmer on the GRRRocker do?
Delicious Audio says you can further customize your sound with the distortion trimmer pot found behind the back panel. A trimmer is a small adjustment pot set with a screwdriver rather than a knob, so it lets you set an internal amount of distortion beyond what the gain control on the front panel offers, then leave it in place.
Does the GRRRocker switch between hard and soft clipping?
Yes. Guitar World reports that a central push button switches between hard and soft-clipping styles, which the publication describes as a new tonal element added to the Blues Breaker-like design. Hard and soft clipping shape the way the pedal distorts the signal, so the button gives two distinct flavors of drive from the same circuit.
How much does the Mojo Hand FX GRRRocker cost?
Guitar World reported in November 2022 that the GRRRocker Overdrive could be expected at a street price of around $150. As a limited edition sold through the Girls Rock! Grand Rapids Bandcamp page, availability may vary from that figure.
Who made the artwork on the GRRRocker?
The powder-coated artwork on the GRRRocker was created with help from Girls Rock! campers, according to Guitar World. The publication describes the artwork as complete with characters, including doodles of ghosts, video game controllers, planets and cacti on the enclosure.
Sources (2)
- Mojo Hand FX launches the GRRRocker, a Blues Breaker-style overdrive for a good cause, Guitar World, 2022-11-04
- Mojo Hand FX GRRRocker Overdrive, Delicious Audio, 2023-02-08
