The Boss ME-50B Bass Multiple Effects offers an all-in-one bass solution, packed with world-class effects delivered in a durable floor unit with easy pedal-style control. From a built-in compressor/limiter and master section to a filter/tone, drive/synth, and delay/modulation section, this device has everything you need to create dynamic bass tones. Experience unparalleled expression with 23 knobs, three footswitches, and an assignable expression pedal. With powerful effects like Sound Hold, Octave Up, and Kick Drum, you'll always have the sound you need.