Roland GP609 digital grand piano: room-filling tone from specially designed speakers One of the joys of a traditional acoustic grand piano is the commanding natural tone and sound projection. The Roland GP609 achieves the same head-turning effect, thanks to a built-in multi-channel sound system that delivers an immersive spatial sound that appears to come from the very heart of the instrument. Whether you’re playing at home – or in larger venues, from restaurants to hotel lounges – you can rely