The Boss ME-90 is a versatile multi-effects processor designed for guitarists. It combines an intuitive interface with a wide array of effects, including amp models, distortions, delays, and reverbs derived from the Boss GT-1000. With its compact design, the ME-90 offers an easy way to create custom sounds. It features 11 AIRD amp models, 60 effects, an expression pedal, and the ability to load user speaker IRs. The ME-90 also boasts a send/return loop for external pedals and integration with Boss Tone Studio for further customization.