Casio CZ/ VZ/ FZ - Pro Series

Hello Friends.

Why do clicks appear when I am using this settings?

           
 vibrato       portamento   detune           line select 1+2´
 wave 1      time              detune (+)    
 delay 0                         oct 1              modulation  
 rate 79      octave          note 1            ring  
 depth 2     range -1        fine 3             noise  
            
 DCO1      DCO2     
            
 wave form  env rate level *** wave form  env rate level ***
 first 8 step1 99 0 sus first 8 step1 99 69 sus
 second 0 step2 0 0 end second 0 step2 0 0 end
   step3 50 0    step3 50 0 
   step4 50 0    step4 50 0 
   step5 50 0    step5 50 0 
   step6 50 0    step6 50 0 
   step7 50 0    step7 50 0 
   step8 50 0 end   step8 50 0 end
            
 DCW1      DCW2     
 ;           
 key follow  env rate level *** key follow  env rate level ***
 wave range 0 step1 99 14 sus wave range 0 step1 99 13 sus
   step2 99 0 end   step2 99 0 end
   step3 50 0    step3 50 0 
   step4 50 0    step4 50 0 
   step5 50 0    step5 50 0 
   step6 50 0    step6 50 0 
   step7 50 0    step7 50 0 
   step8 50 0 end   step8 50 0 end
            
 DCA1      DCA2     
            
 key follow  env rate level *** key follow  env rate level ***
 amp range 0 step1 99 99 sus amp range 0 step1 99 78 sus
   step2 66 50    step2 50 0 end
   step3 66 75    step3 50 0 
   step4 66 0 end   step4 50 0 
   step5 50 0    step5 50 0 
   step6 50 0    step6 50 0 
   step7 50 0    step7 50 0 
   step8 50 0 end   step8 50 0 end


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