Diki's right. Try adjusting your filters. Opening up the cutoff a lot of times makes a huge difference in the sound. If you want a warmer.., and more darker type of piano go in the - direction, but if you need to brighten the sound up a bit go in the + direction. You can also tap the high end a bit after adjusting the cutoff by moving the reso. in the + direction..., but be careful there as going too far will make the sound very metallic.

If you want to bring out the middle register too..., after making filter adjustments..., EQ the patch (obviously using at the minimal a 3-band) Also consider the speaker system of the unit you're using. It's not at all uncommon to have TWO versions of the same sound. One edited for internal speaker play, and the other tweeked for use with outboard speakers.

Good Luck.