Zoom B1X FOUR: The Bass Multi-Effects Pedal That Replaces a Whole Pedalboard

The Zoom B1X FOUR is a complete bass processor in a single compact pedal — 70+ effects, 9 bass-specific amp models, a built-in expression pedal, a 30-second looper, and 68 rhythm patterns, all running on four AA batteries with up to 18 hours of runtime. For a beginner bassist building a first signal chain or a working player who needs a travel rig that fits in a gig bag, the B1X FOUR delivers a tone library that would cost five times more in individual stompboxes.

Over 70 Bass Effects and 9 Amp Models — Every Tone in One Box

The effect engine covers every category a bass player reaches for: tube and solid-state drive, compression, octave, pitch shift, envelope filter, auto-wah, chorus, flanger, phaser, tremolo, delay, and reverb. The 9 bass amp + cabinet models recreate classic vintage tube thump, broadcast warmth, vintage solid-state low-end clarity, and modern punch. Up to 5 effects chain together on a single patch in any order — drop a compressor before the amp, place an octave before the dirt, then run modulation back into the chain to taste. Nothing is locked.

30-Second Looper and 68 Rhythm Patterns for Solo Bass Practice

The built-in looper records up to 30 seconds or 64 beats of CD-quality audio with seamless start and end points — lay down a root-note groove, then layer melody lines, harmonics, or chord work on top. The 68 rhythm patterns cover 4/4, 3/4, and other time signatures so a solo bassist always has a drum part to lock into. Plug a phone or media player into the 3.5mm aux input and jam along to recorded tracks. The integrated chromatic tuner supports standard E, drop D, drop C, and other alternate bass tunings — and the backlit display reads on a dark stage.

Built-In Expression Pedal and a Battery-Powered Travel Rig

The expression pedal sits in the right half of the chassis and assigns to volume, wah, filter cutoff, delay time, or pitch on any effect in the chain. Bassists who want auto-wah-style filter sweeps, real-time volume swells, or pitch dives don't need a second pedal on the floor. Power comes from four AA alkaline cells (18 hours of continuous use), the optional Zoom AD-16 9V AC adapter, or USB bus power from a computer — bassists who plug into a laptop for direct recording don't need an outlet or batteries at all.

Zoom Guitar Lab Editor — Manage Patches and Download New Effects on Mac and Windows

Connect the B1X FOUR by USB to a Mac or Windows computer and the free Zoom Guitar Lab software unlocks visual patch editing, drag-and-drop signal chain reordering, memory slot management, effect downloads, and firmware updates. The Zoom community library adds new effect models over time, so the pedal keeps growing past the 70+ effects it ships with. The same USB connection powers the pedal and routes the wet signal into any DAW for direct bass recording — no audio interface required for scratch tracks.

Who the B1X FOUR Is For: First-Time Bassists, Bedroom Players, and Songwriters

Beginner bassists get a complete tone library at the price of one boutique pedal — every category of bass effect is in the box, and the front-panel interface scrolls through patches faster than a beginner can read pedal labels. Bedroom players get headphone-friendly silent practice with looper and rhythm backing. Songwriters get instant drum and bass demo capability without opening a DAW. Touring bassists keep the B1X FOUR in a gig bag as a backup tone source when the main rig fails or the venue can't supply a proper bass amp. One pedal, 70+ effects, 9 amp models, and a tone library that ships fully loaded.