Don't just fill in all sixteen notes with a snare. Try a few in quick succession, then a short rest, then a few more in succession, then maybe one or two spaced a few notes apart, and then from the 6th or 7th quarter note all the way to the end of the measure just make a straight roll (this is for a two-measure roll). Play with the volume, gate time, decay, release on each individual hit. You can also play around with clock shifts and what not. Just program some stuff, edit the parts that don't work, and reprogram the parts you deleted. Oh, don't forget the pitch controls.