The compact processor runs four effects at once while retaining external pedals, stereo routing, MIDI control, and customizable switching.
Pedalboard space fills up quickly, especially when a player needs several delay, modulation, reverb, and utility options in one set. BOSS is addressing that problem with the EX-4 Effects Expander, a compact processor carrying 120 effects and support for four simultaneous effect blocks.
The EX-4 is designed to complement an existing pedalboard, allowing players to retain their preferred drive, fuzz, compressor, and specialty pedals while adding a larger digital effects library. BOSS will release the EX-4 in October 2026 for $299.99.
The EX-4 Carries 120 BOSS Effects
The included library covers overdrive, distortion, modulation, delay, reverb, and bass-specific processing. Slow Gear and Slicer are included alongside utility blocks for foot volume, dual noise suppression, send and return routing, divider and mixer configurations, and global EQ.
Players can run multiple instances of the same effect, which opens options such as placing two delays or modulation processors in separate positions. BOSS also includes 128 factory memories and 128 user memories for saving personalized configurations.
BOSS has previously applied large effect libraries to processors such as the GX-10 and ME-90B. The EX-4 adapts that concept to a smaller unit intended to work alongside pedals a musician already owns.
Gear Suite Speeds Up Effect Configuration
Gear Suite provides several preconfigured settings for each effect type, with professionally adjusted parameters available from a single control. Players can begin with one of those settings, edit individual parameters, and store the finished version inside a user memory.
A 2.4-inch color display shows the entire effect chain, individual blocks, editing pages, and system menus. Four dedicated FX buttons switch effect blocks on and off with a press, while holding a button opens its editing parameters. Button colors correspond with the effect colors shown on the display, which should reduce menu navigation during setup.
Two dual-function footswitches can be assigned globally or customized for individual memories. Available assignments include effect switching, memory navigation, master bypass, and tap tempo, with surrounding color LEDs indicating the active function.
External Pedals and MIDI Remain Part of the Setup
Four audio jacks support mono and stereo configurations. Two of those jacks can operate as an effects loop, allowing external pedals to sit at selected points inside the EX-4 effect chain.
That loop may be the most relevant feature for musicians who have already built a pedalboard around several preferred units. The EX-4 can provide reverb, delay, modulation, and utility processing while an existing analog drive or specialty pedal remains in its normal position. Readers considering additional hardware can compare that approach with the options covered in my effects-pedal roundup for electronic music producers or revisit my BOSS DS-1W review.
Two external footswitches or an expression pedal can be connected for additional real-time control. Low-profile TRS MIDI connections support communication with MIDI pedals, switching systems, and external clock sources.
BOSS EX-4 Price and Release Date
The BOSS EX-4 Effects Expander will be available in October 2026 for $299.99. Complete specifications, manuals, and product images are available on the official BOSS EX-4 page below.
To learn more about the EX-4, visit www.boss.info.
Will Vance is a professional music producer who has been involved in the industry for the better part of a decade and has been the managing editor at Magnetic Magazine since mid-2022. In that time period, he has published thousands of articles on music production, industry think pieces and educational articles about the music industry. Over the last decade as a professional music producer, Will Vance has also ran multiple successful and highly respected record labels in the industry, including Where The Heart Is Records as well as having launched a new label with a focus on community through Magnetic Magazine. When not running these labels or producing his own music, Vance is likely writing for other top industry sites like Waves or the Hyperbits Masterclass or working on his upcoming book on mindfulness in music production. On the rare chance he's not thinking about music production, he's probably running a game of Dungeons and Dragons with his friends which he has been the dungeon master for for many years.
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