The DGX-660 gives you the natural feel of Yamaha’s GHS Weighted Action – heavier in the bass, lighter in the treble range, as their Pure CF Sound Engine delivers the sound of a world-class 9′ Yamaha CFIIIS concert grand. The Piano Room feature gives you a selection of fine pianos and ambiences to customize your piano sound (it even lets you adjust the lid). Plug a microphone into the DGX-660’s mic input and sing along with your playing – you’ll hear your vocal through the onboard speakers and can record your performance to USB audio.