My comparatively lowly, ancient PSR-7000 has that feature (record a chord sequence, then build on it), so I’m pretty sure the 9000 and 9000pro would as well! I simply record a chord sequence into a Multi-Pad, then play the Multi-Pad with Repeat On, then either switch Accompaniment variations to build up, or start off with, say, Bass and Rhythm LEDs on only in my Accompaniment Arranger section, then add Pad, Chord, and Phrase as desired, or any combination of the two techniques. Why could not a PSR-9000 do this?