The Boss ME‑90B distills pro-level bass processing into a hands-on, pedalboard-ready unit. Starting with ten AIRD-powered bass preamps—including models from vintage to acoustic styles—it empowers players to craft core tone with dedicated EQ and gain knobs. From there, six simultaneous effect categories cover everything from modulation, drive, filters, compression, synth, delay, reverb, and pedal FX, all easily toggled via eight multi-function footswitches and an expression pedal. With 36 user presets, USB‑C, stereo outs, balanced XLR DI, send/return loop, and optional Bluetooth MIDI/audio, the ME‑90B delivers versatile sound-shaping for stage, studio, and practice.