Hey leezone, not only is it an arranger, I am tempted to believe because it has midi sync you can change the chords with a midi program in sync with the styles. You saw from the video the keyboard player was changing variations and adding fills on the touch screen. I was told by Marcello Colo,person who worked on the audio drums, he thinks the midjay is superior in some ways to the audya, eg, styles which are much more flexible, and real audio slices on drums. He also told me for now only midi guitar, but maybe can change in the future.