Here's what Zoom say about the B1on:
With the Zoom B1on, your bass will never have to take a back seat. 100 powerful bass effects and amp models—5 can be used simultaneously, chained together in any order - allow you to deliver the kind of solid foundation your music deserves. You can even construct CD-quality bass loops, perfectly synchronized to the onboard rhythm machine, and there's a built-in tuner too.
Up to 5 effects can be used simultaneously, chained together any way you like. In addition, there are 68 built-in rhythm accompaniment patterns, and you can connect headphones to the output jack (as well as portable music players to the auxiliary input jack) for silent practice sessions. An onboard chromatic tuner supports all standard bass tunings, and a Looper feature allows you to record up to 30 seconds of CD-quality audio. Loop length can be set either manually or to a preset number of quarter notes, and you can loop to any rhythm pattern, with automatic quantization that ensures seamless start and end times.
Programming is simple and straightforward thanks to a streamlined user interface and large backlit LCD screen. Advanced editing features such as Swap, Auto-Save, and Pre-Select make it easy to organize your patches for live performance and allow you to scroll through patches silently while keeping the current patch operational. In addition, the B1on's built-in expression pedal enables you to control input level, output level, or any selected effect parameter in real time.