Saturday Synth Porn: Synth porn or not? The Roland GR-500 Guitar Synthesizer was Roland’s first guitar synth, pre-MIDI. The synth module is controlled by a guitar with a special pickup system that connects to a synth module via Roland’s own 24-pin interface. It uses CV/GATE signals generated by the guitar’s pickup system. The synthesizer module… Read More Roland GR-500 Guitar Synthesizer