Zoom B1-FOUR / B1X-FOUR multi effects pedalIntroducing the Zoom B1 FOUR B1X FOUR multi effects pedal The Zoom B1 FOUR and B1X FOUR take your low end to new heights with over 70 effects and amp models, looper and a built in rhythm section. Plus, access ZOOM Guitar Labs additional library of downloadable effects. For added control, the B1X FOUR features an expression pedal that can adjust effects, such as volume, wah, delay and pitch. More than just the basics, you can craft your signature sound