The Mo(s)ghoul is a MOSFET distortion pedal from RhPf Electronics, conceived and engineered by RhPf's Thomas. It uses hybrid soft-and-hard clipping with an asymmetrical pattern, and its stated aim is a more articulate Big Muff kind of sound, loosely based on the peak sounds of Weezer and Smashing Pumpkins. Guitar Pedal X's Stefan Karlsson judged that aim achieved, writing that "the clipping here is really quite exquisite"1. It lists at $179 as of December 20251.
How it clips and what that does to the sound
The Mo(s)ghoul is a hybrid soft-and-hard-clipping MOSFET distortion. Karlsson described the result in detail: "the peaks of the waves are nicely squared-off, while the troughs are still offset curved - in quite an unusual asymmetri"2. He summed it up plainly: "the Mo(s)ghoul really sounds like a hard-clipper distortion"2.
"Its twin-peaks output can suggest double- or triple-tracked guitars, with asymmetrical clipping, sear and massive sustain."
The EQ shapes that voice in a particular way. With the Mids dialled back, the full mids-dip profile occurs at around 800Hz, with twin peaks at circa 250Hz and 1.6kHz; with Mids fully forward there is a peak at circa 500Hz2. That twin-peaked mid response is what gives the pedal its suggestion of layered, double- or triple-tracked guitars2.
Controls
| Control | What it does |
|---|---|
| Drive | Sets the amount of distortion1 |
| Level | Sets output volume1 |
| Low | Passive 3-band EQ, low band1 |
| Mid | Passive 3-band EQ, mid band1 |
| Hi | Passive 3-band EQ, high band1 |
All controls are passive, so you are sweeping across a fixed scale rather than boosting with active circuitry2.
Compared with the Mosferatwo
The Mo(s)ghoul is the sibling to the previously reviewed Mosferatwo, and both are hybrid soft-and-hard-clipping MOSFET drives2. The difference is where each sits: the Mo(s)ghoul clips quite differently to the Mosferatwo and leans a lot more into the distortion side of things3. Karlsson characterized it as harder, darker, thinner and edgier than the Mosferatwo2.
There is also a volume difference worth knowing before you stack or A/B them: the Mosferatwo at 3 o'clock on its Level dial sounds a lot louder than the Mo(s)ghoul does fully dimed out2.
"The clipping here is really quite exquisite - while I kind of feel it needs a gain recovery circuit to get the volume up"
Lineage and availability
RhPf Electronics, through an association with Rockboard, was including a time-limited bag of Rockboard accessories with the pedal: a crystal LED lens cap, a footswitch topper and pedal dust protector plugs2.
Videos
Philip Czarnecki and RhpF Electronics
We As A Company
Questions
What does the RhPf Electronics Mo(s)ghoul sound like?
Guitar Pedal X's reviewer describes a twin-peaks output that can suggest double- or triple-tracked guitars, with asymmetrical clipping, sear and massive sustain. The design intent was a more articulate Big Muff kind of sound, loosely based on the peak sounds of Weezer and Smashing Pumpkins, and the reviewer judged that aim achieved. Compared with the Mosferatwo, it comes across harder, darker, thinner and edgier.
How is the Mo(s)ghoul different from the Mosferatwo?
Both are hybrid soft-and-hard-clipping MOSFET drives from RhPf Electronics, but the Mo(s)ghoul clips quite differently and leans a lot more into the distortion side of things. It is also quieter: the reviewer found the Mosferatwo at 3 o'clock on its Level dial sounds a lot louder than the Mo(s)ghoul does fully dimed out.
Does the Mo(s)ghoul use soft or hard clipping?
Both. It is a hybrid soft-and-hard-clipping MOSFET distortion with an asymmetrical clipping pattern. The reviewer described the peaks of the waves as nicely squared-off while the troughs remain offset and curved, and said it really sounds like a hard-clipper distortion.
Is the Mo(s)ghoul EQ active or passive?
Passive. According to Guitar Pedal X, all controls are passive, so you are sweeping across a fixed scale rather than boosting with active circuitry. The EQ is three bands, Low, Mid and Hi, alongside Drive and Level controls.
Who designed the Mo(s)ghoul?
The pedal was smartly conceived and engineered by RhPf's Thomas, according to Guitar Pedal X's review. RhPf Electronics is the maker, and the circuit was later evolved into the MOSRAWR Doom Fuzz, a collaboration with Loopy Demos and Sketchy Pedals.
Sources (3)
- Guitar Pedal X, Guitar Pedal X, 2025-12-05
- Guitar Pedal X, Guitar Pedal X, 2025-08-08
- Guitar Pedal X, Guitar Pedal X, 2025-07-18