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Each of the two independent PCM synthesizer sound engines has been loaded up with over 900 of Roland's latest sounds, and the COSM engine can be used to emulate electric and acoustic guitars, basses and other instruments, as well as guitar and bass amplifiers. To start the ball rolling, there are no less than three sound engines offered. The word "overwhelming" comes to mind when reading through the list of specifications and options available on Roland's new GR-55 guitar synthesizer. Featuring a pair of independent synthesizer sound engines and a Composite Object Sound Modeling (COSM) engine, the device makes hundreds of different sounds available to the player – anything from pianos to strings, drums to synths, various acoustic and electric guitar and bass emulations, as well as numerous amplifiers. It was quite simply a marvel, but is positively primitive when compared to the latest evolutionary leap taken by the company with the GR-55 guitar synthesizer. In the late seventies, Roland took the sonic palette available to keyboard players and opened it up to guitarists, with the introduction on the GR-500.