RhPf Electronics MOSRAWR

The RhPf Electronics MOSRAWR is a high-gain fuzz pedal built around MOSFET transistors, aimed squarely at doom, shoegaze and noise-rock players. RhPf describes its sound as "velcro"¹. It was released just in time for Black Friday 2025¹, as an original circuit designed in collaboration with the demo channel Loopy Demos², and it is hand-built in Basel, Switzerland¹.

The name is a play on its character: RhPf calls the sound "velcro," and the pedal's full title on the maker's line is the Velcro Roar fuzz². Guitar.com's reviewer summed up the target player as the pedal-stacking shoegazer who wants a fuzz that holds its own in a wall of sound³.

A MOSFET doom fuzz with a low-mid focus

Guitar Pedal X's Stefan Karlsson called it "a Fierce Doom Fuzz," vibrant and potent, and placed it in his personal "Elite Trifecta" of doom fuzzes alongside the Blackhawk Balrog and the Lichtlaerm Audio Altar¹. That midrange-forward character is the point of the design: Guitar.com's reviewer found it "sounds enormous, just as you'd expect, but also has a midrange focus that keeps it commandingly present in a band mix"⁴. Delicious Audio describes a "Low-Mid Surge" that cuts through the mix, so chords keep their vocal core and leads stay present².

In EQ terms, the reviewer compared it to a Tone Bender, but with high gain and a pronounced lack of headroom that gives it what he called an edge of splatty delinquency⁴. RhPf says the pedal can go from sticky velcro tones to something smoother and more open, though the reviewer found that in practice it does not travel very far along that road⁴.

The controls

The five knobs are straightforward on paper, but the way they work is not always predictable, according to Guitar.com's review⁴. The most unusual control is the Mid knob, which sits before the gain stage and shapes how the fuzz reacts to your playing, rather than just cutting or boosting a frequency band afterward².

Two quirks from the Guitar.com review are worth knowing before you buy: the controls are not as simple as they look, and the tonal range is narrower than the knob labels suggest. With the low control at maximum it never gets very bassy, and with the hi control at minimum it never gets very dark⁴. It also cannot do smooth, Big Muff-style sounds, which the reviewer listed among its few minuses⁴.

Where it came from

The MOSRAWR is an original circuit, designed in collaboration with Loopy Demos⁴. Guitar Pedal X reports that it is loosely evolved from RhPf's earlier Mo(s)ghoul Distortion¹, so players who know that pedal will find some family resemblance, but the MOSRAWR is its own design rather than a reissue.

The collaboration also explains the look. Claudi of Sketchy Pedals did the pink cartoon dinosaur artwork, which Guitar.com's reviewer felt gave the pedal a distinct lift¹⁴.

What reviewers said

Guitar.com's Richard Purvis rated the pedal 9 out of 10 and called its tones "magnificently gnarly," praising in particular how well it gets on with other pedals for creating walls of noise⁴. His caveats: the controls are less predictable than they look, it cannot do smooth Muff-like sounds, and it "will be too boisterous for some tastes, even within the parameters of alternative rock." His verdict on the right owner was a player he described as noise-scapers with attitude⁴.

Karlsson's preferred settings give a starting point for anyone dialing it in for the first time: Roar at noon, Level at max, Low at max, Bite at noon, and Hi at 3 o'clock¹.

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