Korg PA900 61-Key Semi-Weighted Professional Arranger Keyboard with Knox Keyboard Bench, Knox Keyboard Stand, Sustain Pedal, Full-Size Headphones and Dust Cover Enhanced RX (Real eXperience) sound engine offers improved realism and new vivid sound Massive internal ROM  plus up to 192 MB of user PCM data  provides a powerful wave memory, delivering the best sound quality possible Three assignable switches and a four-way joystick ensure total control for the sound articulation levels (DNC  Defined Nuance Control) 61 key semiweighted keyboard with velocity and aftertouch