Can't use voices native to the keyboard in a downloaded song...

[MiddleC]

I am experimenting on a midi song I downloaded, and want to select a voice that is native to this keyboardd (DGX 670). But all I am able to select from is Revoice, or user voices I have on my USB.

So what I see to choose from example pictured here:

I want to choose from this list:

I can go to the User option, but that doesn't getme to the instruments on the keyboard. Is this not possible?