Keyboard/Polyphony 61 regular-sized keys and 32-note polyphony. Voices & Styles Total of 375 high-quality instrument voices (Stereo Grand Piano, 361 XGlite voices, 12 Drum Kits and Sound Effect Kit) and 100 accompaniment styles. Sound Effect Kit 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.) 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. Portable Grand Button 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. Reverb Different reverb types let you add rich, concert-hall ambience to your performance.