Cass, if the edit parameters are important to you.

Select the VK organ[draw bar],
and turn off the offending parameter[vibrato]..
or all of the effects including Leslie simulator..

Now route the organ to separate outs...
from there using patch cords ..route that signal back into the audio ins of the G70..

Go into effects /audio in effects/ and select #57 ..now you can adjust and use any para mater you want with the VK organ..