The advantage of the Chord Sequncer is that it allows you to record an 8, 12, 16, etc. bar chord progression "on the fly" while performing in auto accompaniment mode, and then have that chord progression played back repeatedly anytime during the song, freeing up the left hand completely to more expressively engage the modulation-pitch bend stick in concert with your live instrument solo (sax, guitar) played in the right hand; and then just as quickly go back to auto-accompaniment mode playing.

"Take Five"
Pa3X Chord Sequencer Demo: