Boss EX-4 Effects Expander Compact Multi Effects

EX-4

$329.99

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The BOSS EX-4 Effects Expander is made for players who treat pedalboard space as precious. In one compact stompbox, it drops 120 premium BOSS effects into your existing rig — overdrive and distortion, modulation, delay, reverb, bass-tuned effects, and BOSS originals like Slow Gear and Slicer.

You can run up to four effects simultaneously, including multiple instances of the same effect, and build them into series, parallel, or wet/dry configurations. Utility blocks — foot volume, two noise suppressors, send/return, and divider/mixer — can be placed anywhere in the chain, with an independent global EQ for overall shaping. The onboard effect loop lets you bring outboard pedals into the chain and move them wherever they sound best.

Sound creation is quick thanks to Gear Suite: every effect type comes loaded with multiple pre-made settings with professionally tuned parameters, called up with the turn of a knob and editable to taste. The 2.4-inch full color display lays out the whole signal chain, and dedicated FX buttons — color-matched to the effects on screen — toggle blocks with a press or open editing with a long press.

On stage, rugged dual-function footswitches with new color LED rings keep current assignments visible at a glance, whether you're using Manual mode for stompbox-style control or Memory mode for presets. Four audio jacks cover mono or stereo setups (two can serve as the effect loop), and there's room for two footswitches or an expression pedal plus space-saving TRS MIDI I/O for integration with other MIDI pedals, switchers, and clock sources.

  • 120 premium BOSS effects in an ultra-compact pedalboard-friendly footprint
  • Run up to four effects at once, including duplicates of the same effect
  • Gear Suite pre-made settings for instant, professionally tuned sounds
  • Dual multi-function footswitches with color LED rings and 2.4-inch color display
  • 128 guitar/bass presets plus 128 user memories
  • Mono/stereo I/O, reorderable effect loop, and TRS MIDI in/out

Included in the package are:

Boss EX-4 Effects Expander Compact Multi Effects

Startup Guide

Leaflet: "Read Me First"

AC Adaptor: PSA Series

Rubber Foot x 4

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$329.99

Expanded Range, Small Footprint

Modern players curate their boards carefully, and every slot has to earn its place. The EX-4 packs a huge selection of classic BOSS effects into a space-saving enclosure, making it a strong fit for anyone covering many songs and styles or building professional sounds on the fly.

Sounds Ready In Seconds

Gear Suite gives every effect type multiple pre-made settings with professionally tuned parameters, all reachable with the turn of a knob. Edit them and save favorites to user locations when you want your own personalized setups on tap.

Confident Live Control

The color LED system surrounding the dual footswitches makes current functions easy to identify mid-performance, and Manual and Memory modes cover both stompbox-style and preset-based workflows. Certain effect configurations even allow delay and reverb carryover for seamless memory changes.

120 Premium BOSS Effects

Every major category is covered, from overdrive and distortion to modulation, delay, and reverb, plus bass-tuned effects and BOSS favorites like Slow Gear and Slicer.

Dedicated Utility Blocks

Foot volume, two noise suppressors, send/return, and divider/mixer blocks can be placed anywhere in the effect chain, with an independent global EQ for overall sound shaping.

Four Simultaneous Effects

Run up to four effects at once, including multiple instances of the same effect, with advanced series, parallel, and wet/dry configuration options.

Reorderable Effect Loop

Two of the four audio jacks can serve as an effect loop, letting you place external pedals anywhere within the EX-4's internal chain.

2.4-Inch Color Display

The full color screen shows the complete effect signal chain, individual blocks, editing options, and menus at a glance.

Dedicated FX Buttons

A single press toggles an effect block on or off and a long press opens its editing parameters, with button colors matched to each effect's display color for fast identification.

Frequently Asked Questions

Specs & Support

  • Pedal Type: Multi-FX
  • Effects: 120 Boss FX
  • Presets: 128 User, 128 Factory
  • Analog/Digital: Digital
  • Inputs: 2 x 1/4" (left/right)
  • Outputs: 2 x 1/4" (left/right)
  • MIDI I/O: 2 x 1/8" (In/Out)
  • Other I/O: 1 x 1/4" (expression)
  • USB: 1 x USB-C (firmware)
  • Power Source: AC Adaptor
  • Height: 2.55"
  • Width: 4.6"
  • Depth: 5.43"
  • Weight: 1.13 lbs.
  • Manufacturer Part Number: EX-4

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