The answer would be if an arranger which would vary a style as per BAND IN A BOX does, it takes style elements from a data base but does this at random depending on the chord type.
As Boo knows I have been and still am a Korg & Roland fan, at the moment I use a PSR3000.
Another BIAB feature that arranger could use is the SOLO Around the Melody feature which really bring the thing to life.