RichZ,
I have a LandPride blade/rake set-up, and use a hydraulic cylinder to change the offset., since the top/tilt cylinders on the tractor take care of those functions,(with additional manual adjust for "extremes"), and the "angle " is usually constant for a given run. I set that manually, and use the hyd. offset to swing the blade around obstacles, while holding my course with the tractor. It also makes it easy to "tuck-in" the blade behind the tractor when going into the shed, since I usually want the end of the blade outside my track when working the edge of my driveway, for example.
Larry /w3tcompact/icons/smile.gif