The P-515 uses advanced sampling technology to recreate the classic sound of two famous Yamaha grand pianos. The sounds dont stop there as the P-515 contains presets for over 40 distinct tones spanning everything from strings to drum patterns. Enjoy these sweet sounds through the onboard speakers or use the pianos stereo line outputs to connect to a larger PA system.Genuine Feel The P-515 incorporates Yamaha NWX(Natural Wood Action) keys which are constructed of wood that has been carefully dried and cut to match the feel of Ebony and Ivory. Yamaha VRM (Virtual Resonance Modeling) allows for vivid and richly-varied expression by delivering those sublet changes in sound that comes with the slightest change in pressure. This dynamic expression helps the P-515 deliver the type of playing experience that most other digital models cant touch.Advanced Technology The P-515 offers tons of fun features that will keep you playing for hours. Experiment with on board effects including reverb, chorus and the super cool Piano Room menu which allows you to experiment with different virtual venues and lid settings. You also get access to the Smart Pianist IOS app for updating sounds and settings. The app can even analyze the songs on your smartphone and provide you with a chord chart to follow along with.