What do you mean of that? If you mean patch sound, there's a lot of sound to download from internet, try this Synthzone at Roland/Boss section, it can take you to site that contain D-5/D-10/D-110/D-20 patches as sysex that you can dump to your D-10 from PC. Roland itself provide patches you can download at
http://www.rolandus.com/SUPPORT/SOFTWARE/PATCH3.HTM. But if you mean polyphony, well, D-10 got 30 notes polyphony, and many sound in it use 3-4 partial, 1 partial use 1 note polyphony. If you use sound that only use 1 partial, you got 30 notes to play, but if use sound that use 3 partial, you only got 10 notes polyphony. Figure!