I'm a bit puzzled by the Wet/Dry settings in the reverb on my Sonus 40. I normally use Cathedral at -10, but if I set the Wet/Dry to low/medium/high it moves the cross line on the fader down the screen and the -10 turns into something else.
To my hearing the -10 sounds the same in each case so I'm not sure why you would select a Wet setting if you are not going above the line.