Yammy, while playing an arrangement on the keyboard in real time you can push a button and record the chord changes, for example a 1,6,2,5 progression or even the whole song progression..when you select the chord sequence play button the keyboard continues to play the arrangement back according to the chords sequenced..this is much different than just recording the intire arrangement, you can select any other styles and still have the functions of the styles,fills and variations. The chord sequence loops continuously till you decide to end the song even with the style ending,,If you desire you can re record another chord sequence in real time and still maintain your live play..The chord sequences can also be saved to memory[disk]..When you save the chord sequences,they save space because there is no need to save note and duration as we do in a standard sequence..