Boss announces EX-4 Effects Expander multi-effects unit

September 1, 2026 · 7 sources

Boss announced the EX-4 Effects Expander on September 24, 2026, according to a company announcement dated Los Angeles, CA, September 24, 2026¹. The unit is a compact multi-effects pedal in the multi-effects category, and Boss describes it as a utility pedal for pedalboards²¹.

The EX-4 carries 120 Boss effect types, covering overdrive and distortion, modulation, delay and reverb, plus bass-tuned effects and Boss favorites such as Slow Gear and Slicer³¹⁴. Players can run up to four effects at once, including multiple instances of the same effect³⁴⁵. Utility blocks, among them foot volume, two noise suppressors, send/return and divider/mixer, can be placed anywhere in the chain, and a global EQ shapes the overall sound²¹⁴. Gear Suite supplies pre-made settings for each effect type, and user settings can be saved¹⁴.

The interface is a full-color 2.4-inch LCD with four dedicated FX buttons, a Select knob, a Type/Value knob and three parameter knobs¹⁵⁶. Two multi-function footswitches can be assigned per memory or system-wide, with a color LED system around them¹⁴. Routing options include series, parallel and wet/dry⁴⁵. Four audio jacks provide mono or stereo operation, and two can serve as an effects loop for external pedals¹⁴. Two footswitches or an expression pedal can be connected, and there are low-profile TRS MIDI in and out jacks¹⁴. Sonicstate lists 128 preset memories for guitar and bass plus 128 user memories⁴; Gearnews gives 128 user memories and 128 factory presets⁵. Guitar Pedal X lists the dimensions as 117 x 138 mm and current draw as 300 mA⁶.

Sources differ on price and availability. MusicRadar gives $299 and says the unit will be in stores from October³. Guitar World says it is available now for $299.99². Guitar.com and Bass Gear Magazine give October 2026 at $299.99⁷¹, and Sonicstate gives October at $299.99⁴. Gearnews reports a pre-order price of $329.99⁵, and Guitar Pedal X lists a MAP/RRP of $329⁶.