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Cygnus Distortion / Sustainer

Based On
Cornish P-2 / G-2
Effect Type
Distortion/Sustainer, Fuzz
Build Difficulty
Project Summary
Based on the classic Big Muff circuit, this pedal adds a meticulously-tuned buffered bypass along with an additional transistor-based buffer stage on the effect input.
Cygnus Distortion / Sustainer printed circuit board

Printed Circuit Board

What's included?
PCB only. Build instructions and parts list can be viewed or downloaded from this page.


In stock

Complete Kit

Not yet available.
Kits are developed based on interest, so if you’d like to see one for this project, let us know.
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409 people are interested.

Project overview

The Cygnus Distortion/Sustainer is adapted from the Pete Cornish P-2 and G-2, two Big Muff-based pedals that share a PCB but with several part differences to distinguish them.

Cornish pedals are probably best known for being extremely expensive. There are two reasons for this. First, the build quality and reliability is unmatched. Second, the mysterious nature of them, partially due to the fact that the circuit is obscured and partially because of the A-list of clients. (The P-2 was originally designed for David Gilmour, while the G-2 was developed with Lou Reed.)

Inside, the circuit is a basic Big Muff with a few changes such as a simplified hi-cut tone control and the famous class-A transistor buffer design. The P-2 is similar to a Ram’s Head Muff, while the G-2 was designed to be much lower gain with a drastically different EQ as well as germanium clipping diodes. In fact, until the G-2 it was traced in 2009, people had no idea it was a Muff derivative. The P-2 was traced by Aion FX in 2023.

The Cygnus is a faithful reproduction of the G-2 and P-2 circuits, and the parts list includes both variants. The default is the P-2 circuit, while each G-2 change is listed in the “Notes” column.

We’ve made one major addition in our project: an internal switch allowing the pedal to be used in true-bypass mode instead of buffered bypass. As with the Klon KTR, the buffer mode is “almost always better”, but you can be the judge of that.