The “Autobrake Off” aural warning comes on when the autobrake is disengaged while the aircraft is decelerating either on arrival or a rejected takeoff. This is available on the A320 family, both the CEO and NEO. I’m not sure if its present on other Airbus families but it probably is.
Example at 27:29 (A319ceo)
Example at 20:15 (A320neo)
This would enhance the realism when piloting Airbus aircraft, especially the upcoming A320neo and A321neo :DD
