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1977 | Roland GR500: Overview – Rob OReilly | Expressiv MIDI Guitars
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Roland GR-500, GS-500 and PC-50 | matrixsynth.blogspot.com/2… | Flickr
Roland GR-Series
MATRIXSYNTH: Roland GR-500 Guitar Synthesizer and Module
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Roland GR-500 1977 Vintage Analog Guitar Synthesizer - Photos, Videos, Documentation
Roland GR-500 Vintage Analog Guitar Synthesizer & Controller – Found Sound
