EastWest Quantum Leap Pianos Bosendorfer 290 Platinum is a virtual piano that samples a 98-key, 9.5' Grand Imperial Concert Grand. The piano itself has a warm, dynamic, resonant, and romantic tone. The extended low range gives you a body you can't get from a traditional 88-key piano. Even the patches that only utilize 88 keys benefit from the resonance the extra ten keys provide.