Roland GR1

The Roland GR1 is a guitar synthesizer released by Roland in 1988. It is a guitar-to-MIDI converter that allows a guitar to be used to control synthesizers, samplers, and other MIDI-equipped instruments. It has been used by a variety of artists, including Steve Vai, Joe Satriani, and John Petrucci.

The GR1 works by converting the guitar's signal into MIDI data. It has a variety of features, including a built-in synthesizer, a built-in effects processor, and a built-in sequencer. It also has a variety of controls, including a pitch bend wheel, a modulation wheel, and a variety of knobs and switches. It also has a built-in expression pedal, which can be used to control various parameters.