The BOSS Effect Pedals - SY-1 Synthesizer Pedal is a synth modeler filled with 121 ultra-responsive tones to be infused within your creative arsenal. A wide variety of analogue-style synth sounds are available from leads, basses, layered organs, sweeping pads and arpeggiated sequences; all with no special pickup or programing language required. Tone/Rate and Depth controls quickly adjust the attack and response while independent level controls blend your original guitar tone. Effects loops helps to seamlessly integrate with any rig, plus a mode switch for optimal use with either bass or guitar.