Try this, though...

Turn OFF the internal speakers in the Atelier. Hook it up to a system you normally use for an arranger. Does it sound as impressive?

Probably not. An awful lot of the magic of great home organs comes from a big, beefy, non-direct sound system, optimized for bouncing off walls to fill the room with sound you hear indirectly. Not crappy little three or four inch speakers struggling to get even a semblance of full range sound at even low volumes, or crappy keyboard amps barely capable of being flat...

There's a LOT of money in those big sound systems for TOTL home organs. Put a T3 or G70 through something as capable, and you would be surprised at how good it sounds...