A guitar synthesizer, introduced by Roland in 1979 as a follow-on to the GR-500. The GR-300 voice architecture included two oscillators (not strictly VCOs, explained next paragraph) per string voice, and a paraphonic VCF and VCA, along with an LFO. A number of notable guitarists of the early 1980s took up the GR-300, including Pat Metheny, Robert Fripp, Adrian Belew, and Andy Summers.