With authentic piano sound and feel, a stylish modern design, and the powerful new Sound Projection speaker system, the PX-870 is a brilliant instrument for inspiring brilliant performances. The PX-870's award-winning AiR Sound Source includes a new four-layer stereo grand piano which comes alive with realistic damper resonance, simulating the entire body of the instrument, not just the strings. The piano also includes key action sounds, key off simulation, adjustable hammer response, and a lid