Hearing clickings at the beginning and after jfugue pattern

Question

Making the first steps with jfugue... Pretty easy!

But at the beginning and after the pattern I hear small clicks(pops). It is very important to me avoid them. Working on Windows with Eclipse

import org.jfugue.*; 

public class PlayFreq 
{
    public static void main(String[] args) {

    String A2 =  "X[Volume]=10200 T120 I54 Rq G9i Rq F9q. Rq";
    Player player = new Player(); 
    Pattern ptr_a2 = new Pattern(A2);

    player.play(" Rq G9 Rq");

    System.exit(0); // If using Java 1.4 or lower 
    } 
}   

any ideas?