Bass guitar multi-effect pedal. The Zoom B1 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 Lab’s additional library of downloadable effects. Craft your signature sound with more than 60 traditional and boutique effects, such as octaver, bass synth and fuzz. Recreate your on-stage sound with 9 classic amps and cabinets like Fender, Ampeg, Aguilar and more. ZOOM Guitar Lab offers an endless world of artist patches, effects and more. And with its ability to manage and backup all of your patches, you can experiment with endless combinations. 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. Lay down a bassline up to 30 seconds, and then endlessly overdub your performance to build a dynamic, multi-part arrangement.