DESC: The 88-key YPG-635 is a weighted graded hammer action portable keyboard. Upgrades from the previous model include 64-note polyphony, a beautiful matching bench and an optional three-pedal unit, along with additional DSP (Digital Signal Processing) effects that enable realistic sounding Distortion Guitar and Rotary Organ. It also includes USB MIDI and USB to Device for removable storage, along with a high resolution Live! Grand stereo sample, song recorder, score and lyric display.