For some reason it just trigger my nostalgia... anyway just like everyone else, you can change the velocity of the piano so it will be feel like it being played by human, and some low volume pad or a bit reverb can help.
I'm working on implementing a parameter in ArmonyMaker to humanize the timing and dynamics of the various musical instruments. As you can see from the Ardour screenshot, the reverb on the two pianos is set almost to the maximum, and in my headphones, it sounds just right.
