Until December 14 2026, purchase any BOSS pedal and go into the running to win a Dream BOSS Board - up to $3,000 RRP of BOSS gear, picked entirely by you! Every pedal purchased is another entry: buy in-store and scan the QR code at the counter, or buy online and complete the entry form via the promotion entry page. Full terms and conditions are available on the Roland website. Offer ends December 14, 2026.
The BOSS EX-4 Effects Expander packs a genuine multi-effects library into a compact stompbox footprint, built for players who curate every inch of their pedalboard. Drawing on BOSS's catalogue of 120 premium effects – overdrives, modulation, delay, reverb and more – it runs up to four processors simultaneously, including multiple instances of the same effect. A 2.4-inch colour display and dual multi-function footswitches keep control fast and intuitive, whether switching presets mid-song or tweaking a signal chain on the fly.
Beyond the effect library, the EX-4 includes dedicated utility blocks – foot volume, dual noise suppressors, a send/return loop and a divider/mixer – alongside an independent global EQ for overall tone shaping. Gear Suite presets apply professionally tuned parameters to each effect with a single knob turn, while 128 preset and 128 user memories store custom configurations for instant recall. Connectivity covers mono/stereo I/O, an effect loop for external pedals, and space-saving TRS MIDI jacks for deep integration with switching systems and outboard clocking devices.
Features
- 120 premium BOSS effects across overdrive, modulation, delay and reverb categories
- Runs up to four simultaneous effects, including duplicate instances
- Dual multi-function footswitches with colour LED signal indicators
- 2.4-inch full colour display shows complete effect signal chain
- 128 preset memories plus 128 user memories for custom sounds
- Mono/stereo I/O with flexible send/return effect loop routing
- Space-saving TRS MIDI jacks for external gear integration
- Compact 117×138×63mm footprint weighing 800g
