The CDP-130 is a graded-hammer action 88-key digital piano with Casio's AHL sound source and a rich hall reverb effect. Simple, yet straightforward, the CDP-130 has everything you need to sit down and play. The AHL sound source has built-in tones including piano and acoustic instrument tones that sound better than ever before. The CDP-130 is also equipped with a warm, lush reverb with the acoustics of a grand concert hall. The keyboard features a spring-less hammer system that is similar to the one used by grand pianos that provides a keyboard touch that is naturally firm. Lower notes play relatively heavier than higher notes, just like the keys on a grand piano. Hall Button These pianos are equipped with an effect function that recreates the warm, rich acoustics of a concert hall. Your playing will have the visceral immediacy of a concert hall performance. AHL sound source All built-in tones, including piano and acoustic instrument tones, now sound better than ever before! Scaled Hammer Action Keyboard A spring-less hammer system that is similar to the one used by grand pianos provides a keyboard touch that is naturally firm. Lower notes play relatively heavier than higher notes, just like the keys on a grand piano.