Kawai Synthesizers

Hi everyone,
        I wonder if anyone has experienced the same problem with the 
filter of K4r. In many patches, when the cutoff freq. is being 
modulated by env or velocity, there is a loud pop on the beginning of 
the sound... which can be rather annoying, since it is very audible 
through entire mix and makes amplitude peaks. I usually prevent it by 
delaying the sample a bit or setting the DCF env attack to some 
higher value (even if I want e.g. a bass sound with sharper filter 
attack).
Is it common?
                      Thanx for any info
                               Roman