ClipShifter is a clipping-style limiter that provides enough user controls to be useful in all mixing stages. ClipShifter uses a unique threshold control to change the clipping threshold dynamically based on the transient characteristics of the incoming audio.
The sonic characteristics of the clipping distortion can be altered from hard, brickwall-style clipping, to softer saturation with compression. Additional parameters allow the user to control the even- and odd-order components of the saturation.
http://lvcaudio.com/plugins/clipshifter/