Premium BOSS Effects Unit Instantly Expands the Sonic Range of Any Pedalboard.

For Immediate Release

Rebecca Genel
Global PR/Media Relations Manager
Roland Corporation
(323) 890-3718
Rebecca.Genel@roland.com

Los Angeles, CA, September 24, 2026—BOSS announces the EX-4 Effects Expander, a powerful compact effects processor that infuses any pedalboard setup with a massive boost in sonic versatility. Modern players carefully curate their pedalboard builds, and every slot must earn its place. Offering a large selection of classic BOSS effects in a space-saving design, there’s no better utility pedal than the EX-4. It’s ideal for musicians who love to experiment with effects, and an essential toolbox for anyone who needs to cover many songs/styles or build professional sounds on the fly.

The EX-4 delivers up to four simultaneous effects from a vast onboard library. Every major category is available among the 120 effect selections, including overdrive and distortion, modulation, delay, and reverb, as well as bass-tuned effects and unique BOSS favorites like Slow Gear and Slicer. Dedicated utility blocks can be placed anywhere within an effect chain—including foot volume, two noise suppressors, send/return, and divider/mixer—and there’s also a global EQ for overall sound shaping.

The EX-4’s Gear Suite feature makes it quick and easy to call up ready-to-go sounds. Each effect type comes with multiple pre-made Gear Suite settings with professionally tuned parameters, all available with the turn of a knob. It’s also possible to edit effect parameters and save favorites in user locations for instant access to personalized setups.

A full color 2.4-inch display provides clear viewing of the full effect signal chain, individual effect blocks, editing options, menus, and more. Four dedicated FX buttons allow users to turn effect blocks on/off with a single press and access editing parameters with a long press. In addition, the FX button colors match each effect's display colors for easy identification.

The EX-4 features rugged dual-function footswitches that can be custom-configured system-wide or per memory, with assignments that include effect block on/off, memory up/down, master bypass, tap tempo, and more. A newly designed color LED system surrounds the footswitches, allowing users to clearly identify current footswitch functions while performing.

Four audio jacks provide mono or stereo connectivity, with the option to use two jacks as an effect loop to place external pedals anywhere within the EX-4's effect chain. Two footswitches or an expression pedal can be connected for more real-time control, while low-profile TRS MIDI I/O unlocks deep integration with other MIDI pedals, switching systems, and external clocking devices.

To learn more about the EX-4, visit http://www.boss.info/us/.

Availability & Pricing

The BOSS EX-4 will be available in October for $299.99.

*USD price at the time of publishing.

About BOSS
BOSS, a division of Roland Corporation, has achieved legendary status among guitarists, bassists, and vocalists with a diverse, world-leading product lineup of creative tools with exceptional sound, intuitive control, and rugged durability. Since 1977, BOSS's famous compact pedals have been used daily by everyone from beginners to touring professionals, with over 140 unique models introduced and over 18 million units sold to date. BOSS also leads the way with innovative gear in numerous other categories, from amplifiers, multi-effects processors, and loopers to wireless systems, vocal effects, tuners, metronomes, rhythm machines, recorders, and more. For more information, visit www.boss.info. Follow BOSS on Facebook, X (@BOSSInfoGlobal), and Instagram (@BOSSInfoGlobal).