Boss SD-1 Super OverDrive vs Keeley Super AT Mod (Andy Timmons Full-Range Overdrive)
The Boss SD-1 Super OverDrive and the Keeley Super AT Mod (Andy Timmons Full-Range Overdrive) are both pedals sharing harmonically rich. The Boss SD-1 Super OverDrive leans edge of breakup and warm. Current prices: $59 vs $259.74.
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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.39% — somewhat different
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Genres both listings are associated with.- Alternative Rock
- Blues
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Derived from overlapping tonal signals across both listings.- harmonically rich
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Citation/mention fame — how often this gear is cited across artist rigs and gear discussion.$59via Reverb
$259.74via Reverb
The Boss SD-1 Super Overdrive is a long-running and affordable overdrive introduced in 1981, built around an asymmetrical clipping circuit that distinguishes it from the symmetrical Tube Screamer family. The asymmetrical diodes clip each half of the waveform differently, adding even-order along with odd-order harmonics for a slightly grainier, more aggressive, and harmonically rich voice with a touch more body and output. It shares the mid-pushed character that helps notes cut through a band, but feels closer to real tube-amp breakup, especially when pushing an already clean amp. Players use it as a low to medium gain drive or as a boost stacked into a dirty amp or another pedal. Used by Zakk Wylde, Josh Homme, and countless others, it suits blues, rock, and metal rhythm and lead work.
The Keeley Super AT Mod is an Andy Timmons signature full-range overdrive using asymmetrical clipping, giving it a different tonal character than the symmetrical-clipping Super Phat Mod or BD-2 Blues Driver. As the predecessor to the more elaborate 4-in-1 Muse Driver, it established the foundational Andy Timmons signature overdrive voicing with a more streamlined control set, focused on full-range frequency response and asymmetrical clipping's distinct harmonic character.
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Genres this gear is documented as being used in.- Metal
- Rock
- Classic Rock
- Electronic
- edge of breakup
- warm
- dynamic