This instrument includes an Auto Accompaniment feature that plays appropriate "Styles" (rhythm, bass, and chord accompaniment). You can select from a huge variety of Styles covering a wide range of musical genres. This is how it works. Press the STYLE button, then use the dial to select the desired Style. Next, press the ACMP ON/OFF button to turn on the Auto Accompaniment (ACMP). Press the SYNC START button to turn on Synchro Start on. Play a chord (with one finger) to start playback. Press the START/STOP button to stop playback.  You can easily add variations to your performance by changing the section of the Style. For details, turn to page 59. SOURCE: Yamaha PSR-E463 Owner's Manual. Thanks for watching.