Zoom B1X FOUR Bass Multi-effects PedalsZoom Into Fatter, Badder Bass The Zoom B1X FOUR bass multi effects pedal takes your low end to new heights with over 70 effects and amp models, a looper, a built in rhythm section, and an expression pedal. It also includes access to Zoom Guitar Labs extensive library of downloadable artist patches and effects. Forge your signature sound with more than 70 classic and boutique effects, such as octaver, fuzz, and bass synth. Recreate your onstage tone