Superb Acoustic Performance from a Digital Instrument Elevate your musicianship and set off on an inspiring digital upright piano experience with the Casio AP-550 Celviano digital upright piano. Designed for stellar acoustic-like performance, the AP-550 Celviano doubles down on features that excel in sonic expression and nuance. The Smart Hybrid Hammer Action Keys deliver the subtle detail needed to pull off complex classical passages with ease; meanwhile, the Multi-dimensional Morphing AiR sound source creates a natural, dimensional sound in the AP-550 by adopting a unique string resonance simulator for all of the 88 keys. Pianists can waltz through the included sounds of the painstakingly captured Hamburg and New York grand pianos and explore 26 tones in total. The elegant, functional cabinetry of the AP-550 Celviano is a phenomenal merger of classic looks with an innovative design that includes illuminated touch sensor controls, an eminently capable amplification system, and much more