The Muir Silicon Steel Drive is an overdrive pedal from Muir Audio Design that takes an unusual route to dirt: instead of relying on a conventional gain stage alone, it blends a solid state overdrive with a transformer-based gain circuit, subtly adding non-linearity and magnetic saturation to the signal. Delicious Audio, which reported the pedal when it was announced in October 2023, describes it as a dirt box offering a wide range of tones, from a touch of warm overdrive through meaty crunch and beyond to sizzling but smooth hot solo tones1.
What the transformer stage does
Delicious Audio calls the transformer gain stage the Silicon Steel's secret sauce: low strings resonate with chords, and higher gain delivers a distinctive overdrive with a unique harmonic profile1. Guitar Pedal X, covering the series in its 2023 boost and overdrive buying guide, put the same idea another way:
"The combination of superior components and hi-fidelity audio output transformer delivers superior results!"
That guide also described the sound as a "Superb silky smooth overdrive heavily reminiscent of the Carlos Santana 'Europa' sound"3.
Controls
The pedal carries a 2-band EQ built around two mid controls:
| Control | What it does |
|---|---|
| Mid-cut | Cuts mid frequencies, tuned subtly differently from the mid-boost1 |
| Mid-boost | Boosts mid frequencies, tuned subtly differently from the mid-cut1 |
Delicious Audio notes that the mid-cut and mid-boost frequencies are subtly tuned differently in the two controls, and that they interact with each other to offer a broader EQ range than either alone1.
The Silicon Steel Series
The Drive is one of three pedals in Muir Audio Design's Silicon Steel Series21:
- Silicon Steel Drive, the overdrive covered on this page1
- Silicon Steel Boost2
- Silicon Steel Distortion, which uses what Guitar Pedal X reviewer Stefan Karlsson describes as top secret Silicon Signal Diodes; he notes that Germanium diodes were tried during development and rejected2
Karlsson dubbed the trio "The Silicon Steel Series Trifecta!"2.
The series' balance across rigs, in Karlsson's words, is "incredibly well balanced - and can be adapted easily to any rig", with the extra bass and body working well for single coils and suiting humbuckers when the balance is wound back and pickups are paired carefully2.
Where it sits
As an overdrive, the Silicon Steel Drive belongs to the broader family of Overdrive Pedals that push an amp or a clean platform into breakup, a category that runs from transparent low-gain boosters to the mid-humped designs covered in Boss SD-1 vs Ibanez TS9 Tube Screamer. Players after heavier textures in the same series would look to the Silicon Steel Distortion, covered among Distortion Pedals.
Videos
MUIR AUDIO DESIGN
Joe Perkins
Jackson Brooksby
Questions
What makes the Muir Silicon Steel Drive different from other overdrives?
It combines a solid state overdrive with a transformer-based gain circuit, which Delicious Audio says subtly adds non-linearity and magnetic saturation to the signal. The transformer stage is what the maker's press coverage calls the pedal's secret sauce: low strings resonate with chords, and higher gain settings deliver a distinctive overdrive with a unique harmonic profile compared with conventional diode-clipping overdrives.
What tones can the Silicon Steel Drive produce?
Delicious Audio describes a wide range of tones, from a touch of warm overdrive through meaty crunch and on to sizzling but smooth hot solo tones. Guitar Pedal X's buying guide described it as a superb, silky smooth overdrive heavily reminiscent of the Carlos Santana 'Europa' sound.
Sources (3)
- New Pedal: Muir Silicon Steel Drive, Delicious Audio, 2023-10-06
- Guitar Pedal X, Guitar Pedal X, 2025-11-25
- Guitar Pedal X, Guitar Pedal X, 2023-12-16
