Help: Fill-in complete ending?

[hungtdao]

I have Korg PA588. Unlike my Roland keyboard where I can press the fill-in variation then press End button that allows the fill-in variation to be complete before background music is ended. The PA588 will stop immediately without letting the fill-in variation to complete once I press End button. Has Korg PA588 been designed like that or there is a setting that I can do make my PA Ending like my Roland Keyboard? Any help will be appreciated.