All the on board sounds are PCM, too, which means you can edit them to your liking and save your own presets for use later. The compact, rugged multi-effects pedal contains more than 900 sounds, including all kinds of pianos, synthesizers, and strings. The Roland GR-55 opens up a huge amount of possibilities for any electric guitarist, no matter what style or genre. One minute you are thrashing out chords with a deep, rich distortion, and the next creating a delicate melody rich in reverb and delay, all with the tap of your foot.