The Pettyjohn Electronics CoreX ROUS is a distortion pedal and the CoreX-series version of the company's ROUS, short for "Rodent of Unusual Size". Pettyjohn describes it as "a highly evolved member of the RAT family", blurring the line between overdrive and distortion, and the CoreX version is hardwired for Fire mode from the original ROUS design1.
The CoreX ROUS takes its name from "Rodent of Unusual Size", and Pettyjohn describes it as a highly evolved member of the RAT family, one that blurs the line between overdrive and distortion1.
What it does
The ROUS sits in distortion territory but deliberately crosses into overdrive character, which is how Pettyjohn frames it: a pedal that blurs the line between the two. The CoreX version removes the clipping choice of the original by being hardwired for Fire mode, the setting Pettyjohn carried over from the Original ROUS1. Players who want the original's switching between Fire and other modes would look to the original ROUS instead.
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Questions
Is the Pettyjohn Electronics CoreX ROUS still available?
No. Pettyjohn Electronics discontinued the CoreX series because the power supply the series is designed around is being discontinued. The maker says the series will return only if a suitable replacement power supply is found, so the CoreX ROUS is currently out of production.
What kind of pedal is the CoreX ROUS?
It is a distortion pedal in the RAT family, which Pettyjohn describes as a highly evolved member of that lineage, blurring the line between overdrive and distortion. The CoreX version is hardwired for Fire mode from the original ROUS design.
Sources (1)
- CoreX | Pettyjohn Elec, Pettyjohn Electronics




