Dunlop MXR M78 Custom Modified OD, also known as the Bad Ass Modified OD vs Dunlop Rockma Rockman Metal Ace
The Dunlop MXR M78 Custom Modified OD, also known as the Bad Ass Modified OD and the Dunlop Rockma Rockman Metal Ace are both pedals sharing compressed, mid-forward, full. The Dunlop MXR M78 Custom Modified OD, also known as the Bad Ass Modified OD leans saturated and high gain. The Dunlop Rockma Rockman Metal Ace leans aggressive.
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Blended 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.31% — somewhat different
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Derived from overlapping tonal signals across both listings.- compressed
- mid-forward
- full
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Citation/mention fame — how often this gear is cited across artist rigs and gear discussion.$100.21via Reverb
The MXR M78 Custom Modified OD, also known as the Bad Ass Modified OD, is a vintage-voiced overdrive from MXR by Jim Dunlop based on the 1978 MXR Distortion Plus circuit with additional Tone and Filter controls added to increase tonal flexibility. The 1978 vintage Distortion Plus is known for its warm, smooth clipping character and distinctive compressed saturation that works well into an already-driven tube amplifier. The M78 extends the original circuit with front-panel EQ control that was not available on the vintage unit, allowing players to shape the midrange and frequency balance without requiring external pedals. It bridges the original vintage MXR sound with modern usability.
The Rockman Metal Ace is a battery powered headphone amplifier and distortion unit released in 1994, part of Tom Scholz's Rockman line famous for compact, processed direct tones. It delivers a heavily compressed, sustaining, biting metal distortion with built in compression, volume control and auxiliary stereo input and output for playing along to music. A semi and heavy button changes the character and intensity of the distortion. Beyond practice, its thick, direct sound led many players to use it as a studio direct box or as a distortion unit in front of an amp. It suits metal and hard rock players who want a quiet practice tool or a distinctive, ultra compressed direct distortion voice.
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Genres this gear is documented as being used in.- Classic Rock
- Rock
- Alternative Rock
- Blues Rock
- Metal
- Hard Rock
- saturated
- high gain
- warm
- aggressive
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Occasions this gear suits — judged per model, or derived from its wattage, connectivity and category.- Busking