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The Bluesbreaker II takes the philosophy of Marshall's original Bluesbreaker pedal one step further adding two modes, Blues and Boost, effectively making it two pedals in one. Boost mode is designed with the vintage valve amp or "tone purist" player in mind, for when you don't want to alter the tone of your amp at all, but want to drive the front end harder to push the amp further into natural overdrive.
Product Ref: 21886