I just figured out, that there is no possibility in Sonar to edit the Wave FX effect added to the audio tracks. I used to use this option in Adobe with the right mouse click and it was very handy to edit the effect.
Now, when I select say EKramer VC Stereo, add it on the track and then want to change some parameters, I need to delete the effect, then go again to the long list, select the effect and only then to change anything...
May be I am doing something wrong?
PS The solution has been found (see under).