arranger_yes_pc_no,
Don't need a chord track....for what I usually do...In this process you can fix not ony chord mistakes but other kinds as well.

If I want to quickly record a song I use this mode:

(From the manual)
Backing Sequence (Quick Record) mode allows you to quickly
record your live performance with the Styles. To make things
easier, just two grouped tracks are provided: Kbd/Pad (Keyboard
and Pads) to record keyboard and pads, and Ch/Acc (Chords/
Accompaniment) to record Style commands and chords played
on the keyboard.

(When you save the song it then creates all 16 tracks.)

THEN, if you want to change something like a wrong chord...here is the answer:

The 'STEP' Backing Sequence mode allows you to enter single
chords, to create or edit the Style (Chord/Acc) part of a Song.
This mode lets you enter chords even if you are not a keyboard
player, or 'FIX ANY ERROR' made playing chords or selecting Style
controls, during a Backing Sequence (Quick Record) recording.

(There is, of course a full PRO level 16 track sequencer that is built in.)

It works great and it is very easy to fix mistakes.

There is a lot in all these arrangers that are sometimes not apparent in a read of the manual...anyway that's what I have learned.
I discovered how this works when I actaully started recording songs the first week.

Lee S.