The Williams WP3S Grand Piano-style 3-Pedal Controller is the ideal option for your Allegro IV or Legato IV digital piano, bringing a more authentic piano look and feel to your playing. It includes Sustain, Sostenuto and Soft controller pedals, enabling you to play more complicated and intricate musical passages the way the musical author originally intended, while also giving you a wider playing palate for creating your own musical compositions.