The PSR-E223 features 375 natural sounding voices, including Stereo Grand Piano, 361 XGlite voices, 12 drum kits and a sound effect kit. The PSR-E223 also has 100 accompaniment styles and 102 built-in songs. Use the Portable Grand button to instantly call up an authentic stereo grand piano sound. The instrument also has a rich Reverb effect that adds concert-hall ambience to any performance. The Yamaha Education Suite feature makes learning and practicing music more fun than ever before. 61 regular-sized keys and 32-note polyphony. Total of 375 high-quality instrument voices (Stereo Grand Piano, 361 XGlite voices, 12 Drum Kits and Sound Effect Kit) and 100 accompaniment styles. Try out each key and enjoy the sound of a dog burking, running water, a creaking door and many other unique effects. Yamaha Education Suite (Y.E.S.) is an advanced set of helpful learning tools built into the instrument, letting you teach yourself how to play and perform. Y.E.S. helps you master a song with easy lesson steps. Each lesson can be done in isolation with either your left hand or right hand, or both. Playing piano is fast and easy with Yamaha's Portable Grand function. One dedicated button brings up a great sounding piano, stunningly rich and authentic in its sound and exceptionally responsive to your playing touch, as well as setting up the keyboard to play as a piano.