Making bass bigger than ever. The Zoom B1 FOUR Bass Multi-Effects Pedal is one incredibly powerful tool. It gives you over 70 built-in effects at the push of a button so you can give your bass a thunderous roar and unlimited depth. But its got far more tricks than that up its sleeve. From the built-in looper to the chromatic tuner – its got everything to keep the modern bassist euphoric about their sound and rig. And youll be blown away by its performance.