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The Boss EX-4 is a premium multi-effects unit that opens another dimension of pedalboard possibilities. Featuring combine any 4 out of 120 Boss effects at once & versatile routing options
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Sound Beyond Space
Step beyond the boundaries of sound and space with the EX-4. Engineered for maximum space efficiency expansive connectivity, this premium multi-effects unit opens another dimension of pedalboard possibilities.
Fueled by 120 stellar BOSS effects, the EX-4’s intuitive, and color-coded controls allow guitarists, bassists, and other sonic adventurers to navigate a universe of limitless tone with ease. Combine up to four effects simultaneously and explore new creative frontiers on stage or in the studio, all while saving valuable space on the deck.
120 Effects
Packed with 120 world-class BOSS effects, the EX-4 brings a virtually limitless range of premium sounds to any pedalboard.
Gear Suite
Gear Suite function makes sound creation quick and easy, allowing players to call up ready-to-play effects and save favorite parameter setups for each effect type.
Easy Operation
Informative color displays, clickable rotary knobs, and dedicated FX buttons help you shape your tone fast.
Expansive Control
Manual and Memory modes provide stompbox-style or preset-based switching. Expand control with up to two external switches or an expression pedal, plus MIDI In/Out for seamless integration.
256 Presets
128 preset memories for guitar and bass, plus 128 user memories for saving custom sounds.
Flexible I/O with FX Loop
Versatile mono/stereo I/O with flexible effect loop to build reorderable chains using external pedals.
Advanced Signal Routing
Create complex effect configurations with advanced series, parallel, and wet/dry options.
Flawless Memory Switching
Lightning-fast memory changes plus full carryover of delay and reverb trails for flawless transitions.
Utility Blocks
When building presets, you can place up to two Noise Suppressors (one on Serial 1 only) and a Foot Volume anywhere in the signal chain. Finally, polish your tone with a three-band Global EQ.
You can substitute stereo I/O functionality with a Send/Return block, which also enables wet/dry setups and the FOUR-CABLE METHOD.
Structure
Tailor the signal structure of each preset to create your perfect tone. Set the chain to series, parallel, or wet/dry, and reorder effect blocks as required. Combined with the Send/Return block, this allows you to further refine your tone and create complex pedal board configurations.
On-The-Fly Control
Assign up to eight parameters to built-in and external control footswitches per preset for enhanced on-the-fly effect performance.
Complete Effect Library
The EX-4 spans every major effect category—including drive, modulation, delay, and reverb—plus bass-optimized effects and standout BOSS favorites like Slow Gear, Slicer, and more.
Boss EX-4 Effects Expander Features:
Accessories:
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