Quick Product Summary

The BOSS EX-4 Effects Expander is a compact multi-effects unit designed to dramatically increase the tonal range of an existing pedalboard without taking up excessive space. Packed with 120 high-quality BOSS effects, it can run up to four effects simultaneously and covers everything from drives and modulation to delays, reverbs, bass effects and distinctive BOSS favourites.

Its combination of a 2.4-inch colour display, dedicated effect buttons, dual programmable footswitches, 128 preset memories and 128 user memories makes the EX-4 equally capable as an on-the-fly pedalboard utility or a powerful preset-based effects hub. Flexible stereo connectivity, MIDI integration and a configurable effects loop also make it easy to incorporate existing pedals and external controllers.

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What Makes the BOSS EX-4 Special?

The EX-4 provides a huge selection of BOSS effects in a footprint small enough to integrate into an existing pedalboard. Up to four effects can operate at once—including multiple instances of the same effect—with serial, parallel and wet/dry routing possibilities. Dedicated utility blocks including foot volume, noise suppression, send/return and divider/mixer functions add even greater flexibility.

Despite its depth, the EX-4 is designed for fast operation. Gear Suite helps you quickly call up ready-to-play sounds and save favourite parameter configurations, while dedicated FX buttons and the full-colour display make navigating an effect chain straightforward. Manual mode provides a traditional stompbox-style workflow, while Memory mode allows more sophisticated preset-based operation.

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Who Is It For?

The BOSS EX-4 is ideal for players who want to expand what their existing pedalboard can do without replacing the pedals they already enjoy.

It is particularly suited to:

• Guitarists building versatile live pedalboards

• Bassists looking for dedicated bass-compatible effects

• Players covering multiple styles within one set

• Musicians who need fast access to a broad range of sounds

• Pedalboard users wanting to add MIDI control

• Players combining traditional pedals with digital multi-effects

• Studio musicians who need flexible routing and sound options

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At A Glance

Feature	Details
Brand	BOSS
Model	EX-4
Product Type	Effects Expander / Multi-Effects Pedal
Condition	New
Onboard Effects	120
Simultaneous Effects	Up to 4
Memories	128 Preset + 128 User
Display	2.4" Full-Colour
Main Appeal	Extensive BOSS effects in a compact pedalboard-friendly format
Best For	Guitar, bass, live pedalboards and studio setups

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What's Included?

• BOSS EX-4 Effects Expander

• BOSS PSA-S Series AC adaptor

• Startup Guide

• "Read Me First" leaflet

• 4 x rubber feet

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Technical Specifications

Effects

• Number of Effects: 120

• Maximum Simultaneous Effects: 4

• Multiple instances of the same effect can be used

• Serial effect-chain configuration

• Effects can be reordered

• Advanced series, parallel and wet/dry configurations

• Guitar and bass-compatible effects

• Effect categories include:

  • Overdrive and distortion

  • Modulation

  • Delay

  • Reverb

  • Bass-tuned effects

  • Special BOSS effects including Slow Gear and Slicer

• Utility blocks include:

  • Foot Volume

  • 2 x Noise Suppressor

  • Send/Return

  • Divider/Mixer

• Global EQ

Memories & Operating Modes

• Preset Memories: 128

• User Memories: 128

• Operating Modes: Manual and Memory

• Seamless memory changes supported

• Delay and reverb carryover available with compatible effect configurations

Display & Controls

• Display: 2.4-inch full-colour screen

• Dedicated FX1, FX2, FX3 and FX4 buttons

• FX button colours correspond with effect display colours

• Dual multifunction footswitches

• Colour split-LED footswitch indicators

• Configurable footswitch assignments

• Gear Suite sound creation function

• Dedicated rotary controls for navigation and editing

Footswitch assignments can include functions such as:

• Effect on/off

• Memory up/down

• Master bypass

• Tap tempo

• Additional custom control assignments

Connectivity

• Four audio jacks for flexible mono or stereo operation

• Configurable effect loop

• External pedals can be positioned within the EX-4 effect chain

• External footswitch connectivity

• Expression pedal connectivity

• TRS MIDI Input

• TRS MIDI Output

Compatible External Controllers

Compatible BOSS footswitch options include:

• FS-5U

• FS-5L

• FS-6

• FS-7

Compatible expression pedal options include:

• BOSS FV-500L

• BOSS FV-500H

• BOSS EV-30

• Roland EV-5

Compatible TRS/MIDI cables include:

• BMIDI-5-35

• BMIDI-1-35

• BMIDI-2-35

• BCC-1-3535

• BCC-2-3535

Dimensions & Weight

• Width: 117 mm

• Depth: 138 mm

• Height: 63 mm

• Weight: 800 g

• Country of Origin: Malaysia

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Power Requirements

The BOSS EX-4 is powered using a BOSS PSA-S Series AC adaptor, which is included with the unit.

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FAQs

Can the BOSS EX-4 be added to an existing pedalboard?

Yes. The EX-4 has been specifically designed to complement an existing pedalboard, giving you access to a large additional effects library without requiring an extensive collection of individual pedals.

Can I combine my existing pedals with the EX-4 effects?

Yes. Its flexible effect loop allows external pedals to be integrated into the EX-4's signal chain. This makes it possible to combine favourite analogue or digital pedals with the internal BOSS effects.

Can external pedals be moved within the EX-4 signal chain?

Yes. The effect loop can be incorporated into the internal chain, allowing compatible external pedals to be positioned at different points in your overall effects routing.

Can the EX-4 run two copies of the same effect?

Yes. Multiple instances of the same effect can be used as part of the four available simultaneous effect blocks, opening up options such as stacked drives or multiple modulation and delay stages.

Is the BOSS EX-4 suitable for bass guitar?

Yes. The EX-4 includes bass-tuned effects and is designed for both guitarists and bassists, making it suitable for building dedicated bass pedalboard sounds as well as conventional guitar rigs.

Can the EX-4 work as a conventional stompbox-style effects unit?

Yes. Manual mode provides a more traditional stompbox-style approach, allowing effects to be controlled directly rather than relying solely on complete preset changes.

Can I control the EX-4 with MIDI equipment?

Yes. TRS MIDI input and output connections allow integration with MIDI controllers, pedal switching systems and external clocking equipment, making it suitable for more sophisticated live rigs.

Can I add an expression pedal?

Yes. Compatible expression pedals can be connected for additional real-time control. Supported options include the BOSS EV-30, FV-500L and FV-500H, along with the Roland EV-5.

Can delay and reverb trails continue when changing presets?

The EX-4 supports seamless memory changes with delay and reverb carryover in compatible effect configurations, helping transitions sound more natural during live performance.

Is the EX-4 only useful for live performance?

No. Its extensive effects selection and flexible routing also make it highly useful for recording, sound design and studio experimentation, particularly where a wide variety of effects need to be accessed quickly.

Does the EX-4 come with a power supply?

Yes. A BOSS PSA-S Series AC adaptor is included, so a separate power supply is not required.

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Trade In. Trade Up. Save More.

Looking to upgrade your pedalboard or move on equipment you no longer use? Fair Deal Music buys, sells and part-exchanges pre-owned musical equipment.

Trade in your existing pedals, effects processors or other music gear and put their value towards the BOSS EX-4 Effects Expander. Contact our Birmingham team for a valuation or visit us at 79–83 Holloway Head, Birmingham.