the bottom, there should be a layer section. soft gradient hard, then "voice limit". Soft is set stock at 1-20 velocity, 4 limit, so anything there will have 4 different samples in the pool. Gradient 21-126, same thing stock, and hard 127, same thing stock. Layer limit means you hit a cymbal 5 times. hit 1 will play until it no longer registers (the sample is over), OR on the 5th hit, if sample 1 is still playing, it fades it quickly.
Make sure randomization is turned on on your right hand side.