Effects Expander

Take your creative vision to the next level with the EX-4, an innovative BOSS effects unit that expands the range of your pedalboard—without changing what already works. This compact inspiration machine complements your current setup with new sound-shaping options and real-time performance tools, encouraging you to explore fresh textures with the rig you already love.
* Compact effects processor that expands the capabilities of any pedalboard
* 120 premium BOSS effects, including overdrives/distortions, mod effects, delays, reverbs, and more
* Run up to four effects at once, including multiple instances of the same effect
* Dedicated utility blocks, including foot volume, two noise suppressors, send/return, and divider/mixer
* Fluid operation with an informative color display, intuitive knobs, and dedicated FX buttons
* Independent global EQ for overall sound shaping
* Gear Suite feature allows you to quickly configure each effect with the turn of a knob
* Control effects using dual multi-function footswitches with color LEDs
* Versatile mono/stereo I/O, flexible effect loop, and space-saving TRS MIDI jacks
* Manual and Memory modes for stompbox-style or preset-based effect control
* 128 preset memories for guitar and bass, plus 128 user memories for saving custom sounds
* Create complex effect configurations with advanced series, parallel, and wet/dry options
* Use the effect loop to build reorderable chains with external pedals
* Seamless memory changes with full carryover of delay and reverb effects possible with certain effect configurations
* Use the footswitches for basic effect and preset control, or access deeper assignment features for sophisticated custom operation

https://www.boss.info/global/products/ex-4