Donner Dark Mouse vs Walrus Audio Iron Horse V3

The Donner Dark Mouse and the Walrus Audio Iron Horse V3 are both pedals sharing op-amp. The Donner Dark Mouse leans aggressive. The Walrus Audio Iron Horse V3 leans high gain and mid-forward. Current prices: $39.99 vs $210.86.

Similarity
citedBlended from circuit-archetype lineage, dynamic feel, tone-signal overlap and tone-vector distance — the tone vector itself is derived from editorial description text, not a measured acoustic signal, so this reflects how similarly the catalog copy describes the two, not a lab measurement. Shown only within a gear class, and only where there's enough evidence to be meaningful.

45% — somewhat different

Shared tone character
citedDerived from overlapping tonal signals across both listings.
  • op-amp
Citation fame
citedCitation/mention fame — how often this gear is cited across artist rigs and gear discussion.
0%
0%
Price

$39.99via Reverb

$210.86via Reverb

Description

The Donner Dark Mouse is a distortion pedal from the Chinese budget effects manufacturer Donner, inspired by the ProCo RAT circuit with a darker voicing. RAT-inspired distortion circuits deliver a distinctive clipping character using an LM308 op-amp and variable filter for bright to dark tone shaping. The Dark Mouse name references the original RAT mouse design while emphasizing a darker, warmer distortion voicing.

The Walrus Audio Iron Horse LM308 V3 is a high-gain distortion built on the LM308 op-amp at the heart of the ProCo RAT, delivering meaty, punchy, gnarly dirt that gets genuinely rowdy in front of an amp. It is not a straight RAT clone: the highs are rolled back and the bass more accentuated, giving a thicker, darker and slightly fuzzier voice with a smoother midrange, less presence and less flattening of the guitar's natural low-end bloom than the original. The V3's headline change is a continuous clipping dial that blends between different clipping diodes, reaching hybrid textures no single-diode circuit can produce, from tight and compressed to loose and open. It adds top-mounted jacks, a soft-relay true bypass switch and a fixed volume drop-off with the distortion knob at minimum.

Genres
citedGenres this gear is documented as being used in.
  • Grunge
  • Rock
  • metal
  • punk
  • hard rock
Tonal lean
  • aggressive
  • high gain
  • mid-forward
  • tight
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