The Zoom B1X Four takes your low-end to new heights with over 70 effects and amp models, looper and a built-in rhythm section. Plus, access ZOOM Guitar Lab’s additional library of downloadable effects. Loop Yourself In Lay down a bassline up to 30 seconds, and then endlessly overdub your performance to build a dynamic, multi-part arrangement. X is for Xpression For added control, the B1X Four features an expression pedal that can adjust effects, such as volume, wah, delay and pitch. Beyond the Bass-ics Craft your signature sound with more than 60 traditional and boutique effects, such as octaver, bass synth and fuzz. Your New Rhythm Section Play your bass to 68 different drum patterns! The B1 Four series offers a built-in drum machine with a variety of rhythm patterns in 4/4, 3/4 and more. Classic Amps Recreate your on-stage sound with 9 classic amps and cabinets like Fender, Ampeg, Aguilar and more*. Power Options The B1 Four/B1X Four can operate with four AA batteries. You can also use an optional Zoom AD-16 AC adapter or run your pedal via USB bus power.