A guitar synthesizer introduced by Roland in 1984. In response to complaints about the timbral limitations of the previous model, the GR-300, Roland turned away from the GR-300's phase-locked oscillators and went back to using a pitch to voltage converter to generate a pitch control voltage and gate signal for each string, in the manner of the earlier GR-500 model. This facilitated a much more versatile voice architecture, but had negative impacts on playability which ultimately limited acceptance of this model.
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