Yea it seems the alt key basically gives the opposite of what the brush is set to do. So if the bust is in paint effect mode alt will put it in unpaint effect. If the brush elevation is set to highest elevation, alt key will set it to lowest elevation, ( or invert the paint brush elevation ) same with min and max, the only one it doesn't seem to change is erosion. Yea Ctrl?e does seems to have something to do with raising the elevation. Thank I'll have to work on that one.

Stephen Ray