IP defaults:

sx = 0
sy = 0
lr = 0
ud = 0
sigma = 1.0
const = 1.0
range = 5.0
scale = 256.0
thresh = 128.0
connect = 2

At any time the current set of parameters can be stored to be restored later. This is of most value when constructing macro replays (see the Sequence Tool for details.)