The Yamaha NP11 is a 61-key digital piano that takes Piaggero's signature concept of slim, light, and compact to a new level. It features high-quality voices that sound more realistic than ever before, and a wide variety of simple, user-friendly functions. With Yamaha's renowned digital expertise and quality craftsmanship, the NP11 was designed and built with the beginner in mind. Its inspiring expressive sound, touch-sensite keys, and easy portability (thanks to a mere 11 lb. weight and battery power) make it the perfect practice instrument that you can take with you anywhere you go. Try that with a 9-foot Steinway.Slim, light, and compact designWalk in, carrying the NP11 with one hand, and play anywhere thanks to the new slim, light and compact design-it's that easy.Piano-style keyboardThe NP11 has a 61-key piano-style keyboard with touch sensitivity. The lighter feel of the keys and dynamic expression provided by velocity-sensing keys makes it easier for beginning students to overcome the physical difficulties of learning piano while learning to play expressively. This facilitates a more natural transition to the weighted keys of more advanced keyboards or the action of an acoustic piano.Advanced Wave Memory (AWM) stereo samplingAWM is a stereo sampling technique that creates superb wave data, which mirrors the sound and expression of the original instrument. It creates a unique, rich sound by using multiple waveforms. On an actual piano, the attack and harmonics of notes change as they are played at different volumes.