The 128 note polyphony also adds to the realism when playing and prevents muted notes. This digital piano comes equipped with 8 high-quality voices, 128 backing rhythms and 30 demo songs. The D55 has some impressive features - tranpose, chord, sustain, reverb, trill, record/playback function and metronome. There is also a MIDI output as well as USB A, USB Host, Aux In and Aux Out. This piano is perfect for performance or practice whether you are looking for a portable instrument (weighing under 12kgs) to take with you or if you are on a budget, seeking a realistic, natural-sounding piano. Included is a piano style sustain pedal, power supply and music rest. Features: 88 Full Size Keys with Graded Real Hammer Action Keys 8 High-Quality Voices, 128 Backing Rhythms, 30 Demo Songs 128 Note Polyphony. Features - Chord, Sustain, Reverb, Trill, Metronome MIDI Output, USB A, USB Host, Aux In/Out Piano Style Sustain Pedal, Music Rest, Power Supply Included Record/Playback Function Specification