EXS 24 Logic Sampler Users Group

A lot of my classical instrument samples (from Pro Samples 
"classic Orchestra" / peter siedlaczek) are clicking on every note 
they play. I heard them not do that on a G4 with the same setup I 
have - is it the fault of my G3? Does anybody have the same 
problem and knows a way around it? (other than "buy a G4")
Thanx!