Re-Diki Post. As a home player I have had different brand of arrangers for the past 50 years (yes I'm old).
No arrangers so far out of it's box has been set to give it's best sound quality wise.
I have always spent time learning a models OS so editing adjustments can be made to improve ones playing enjoyment.
Many times I have attended a Manufactures demonstration to hear other customers ask why does their same keyboard not sound as good as the demonstrators.