Like a bass-based Swiss Army knife, the Zoom B2 Four multi-effect unit wraps up a range of different preamps, amplifier emulations and effects with Zoom's own Multi-Layer IR technology to result in near-endlessly variable bass sound. Basically, everything you could ever need has been stacked into one neat pedal, including a bass amplifier, so whether you're on stage or working in the studio or rehearsal room, you can jack directly into the PA system and select one of the three valve-style or three transistor-style DI amp emulations to complete your virtual setup. The Zoom B2 Four: Classic, High-Grace Bass Sound As well as space for 300 user patches, this Zoom offering already comes loaded with no-less-than 250 factory presets so bassists can immediately get to work with a near-countless selection of high-quality profiles that span everything from the contemporary to classic fifties-flavoured bass sound. By teaming up one of the Sun CB or Monotone amp models with one of the five extremely diverse preamps, you can basically create your own custom rig before colouring in the result through a range of inspiring effects, including octavers and synths. Up to five effects can be grouped and activated at the same time, and via the set of four rotary encoders, your effect parameters can be bent and moulded into perfect shape. Loop, Groove & Record Even if you're busy honing your lines alone and in your bedroom, you can back up your jamming sessions with the built-in 60 second looper and library of 68 drum beats. Via the full-speed 2.0 USB port, the Zoom B2 Four can even be hooked up to a computer or smartphone to serve as a personal audio interface, and using the compatible Handy Guitar Lab app, you're free to expand your sonic arsenal with the newest effects and patches. A great choice for bassists looking for the most compact rehearsal, gigging and recording tool, the B2 Four is nothing short of a slick revelation.