John Mayer’s Boss Blues Driver BD-2 (Keeley Phat mod)
Used by Mayer most notably during the trio era (circa 2005). The BD-2 that John used was modified by Robert Keeley altering the sound significantly from the stock model.
Among others, the mod includes changing several of BD-2s inside components and adding a PHAT switch which activates a lower frequency booster for a somewhat bassier or “fatter” sound.
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