Roland GR-55S-BK Guitar SynthesizerThe GR 55 from Roland is a guitar synthesizer with features not available in other guitar processors. Guitars are not normally thought of as synthesizer controllers, but the company has been pursuing this concept for many years. When paired with a Roland GK 3 pickup, or other similar pickup (sold separately), any electric guitar can trigger the sounds of the tone module with imperceptible latency, a huge consideration when playing live. Pitch