Description from Yamaha Website: Sit down at a CLP Clavinova and enter a world of ultimate realism. With the incredibly lifelike sound of Dynamic Stereo Sampling AWM tone generation. The astonishingly realistic and responsive GH and HE keyboards, and a host of other exciting features and functions at the service of your artistry. There's never been so much music-making power packed into such a stylish, compact cabinet. The CLP Clavinova, the ultimate digital piano. Stereo Sampling AWM AWM (Advanced Wave Memory) tone generation has long been recognized as the industry-leader for realistic sound. Because the original sample is close to what you play, AWM has less work to do, and so the sound is even more realistic. And it's this realism plus a wider dynamic range that makes these CLP Clavinovas sing, allowing you to give performances full of passion and expression. Total Lifelike Keyboards It took the experience gained over 100 years of crafting fine acoustic pianos to create Yamaha's latest masterpieces: the GH (Graded Hammer Effect) and HE (Hammer Effect) keyboards. Graded Hammer Effect (GH) and Hammer Effect (HE) These keyboards offer the sensitive touch response that makes Yamaha the industry leader in digital pianos, plus a unique extra: instead of using springs or oil dampers to simulate the feel of an acoustic piano, the GH and HE keyboards use actual weights and mechanical linkages to bring an entirely new level of realism. Graded Hammer Effect For the ultimate in lifelike feel, the CLP880/880M/860/860M/840 feature the GH keyboard, with the weighting of the keys graded from the heavier in the lower register to lighter in the higher register — just about as close as you can get to the real thing. Wide Range of Voices