This wiggle allows to wiggle only on one side, i.e. positive or only negative. If you choose positive, the wiggle makes only values larger than the keyframed one, if you choose negative it only makes smaler ones.
number of wiggles per second (i.e. how fast it wiggles)
maximal size of the wiggle (i.e. how much it wiggles)
positive = each wiggle makes the value larger than the keyframed one, negative = each wiggle makes the value smaler.
number of octaves of noise to add together. The more octaves the more detail is in the wiggle.
controls how fast the harmonics drop off