283 realistic instrument voices, 11 Regional voices, 480 XG voices, 14 Drum/SFX kits and 8 Regional Drum/Percussion kits,16-track sequencer,Style Creator,176 built-in accompaniment styles including 14 Regional styles,Fully XG-compatible,The PSR-S550 inherit the high-quality sound features of the PSR-S700/S900 to the max, resulting in improved musical performance through increased polyphony and more voices variations, Using the 16-track sequencer and Style Creator, the ability to produce a wide array of music has greatly increased.

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