GT-1B Bass Multi-Effects Processor Premium BOSS sound engine specially tuned for bass The GT-1B gives bass players a massive range of pro tone-shaping power in a small & robust package. Backed by BOSS’s flagship sound engine, you have full access to a huge selection of bass-optimized amps and fx for stage and studio playing. The streamlined interface lets you dial in sounds fast, while the onboard control switch & expression pedal enable you to adjust multiple effects in real time. And by connecting to BOSS Tone Central, you can download new patches, editing software, & more.