The Yamaha DGX-640, released around 2010, is an 88-key "Portable Grand" digital piano known for its weighted Graded Hammer Standard (GHS) keyboard, realistic piano sounds, and automatic accompaniments, serving as a popular step-up model from its predecessor (DGX-630) and paving the way for later models like the DGX-650. While a dedicated English Wikipedia page might be limited, information highlights its piano-like feel, extensive features for learning and creating music, and its role in Yamaha's popular DGX series, focusing on a true piano experience with digital versatility.
