I hope Yamaha has included the ability to store the sequence in memory, and the ability to transpose it while playing. Korg has only recently made it so you can store it to Songbook. They have even INCLUDED chord sequences in some of their new styles.
Roland had this feature many years ago but somehow opted to not included it on the EA7. BK9, an earlier model, still has it, but you can't transpose. The transpose feature is not important to me, but it is to many people.
This feature allows you to play the chords to a song, or a segment of a song, then play back with it, freeing up both hands for use in using the joystick, changing settings, or playing both hands without worrying about chord changes.
I don't use it as much as I should, but it is extremely helpful when pitch bends are needed at the exact moment of chord changes. The songs Sleepwalk, Steel Guitar Rag, Tuff and others NEED this feature, unless you want to just play with full midi sequences, which I don't like to do much.
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DonM