The release behaviour of Mpressor is linear by default, this means that the gain is restored back to unity at a constant rate. What Anti-Log does is change this release curve to an inverted (anti) logarithmic release meaning that the gain is restored all of a sudden at the end of the release period. This can be useful as it has the effect of pushing the loudest part of the recovery to the end of the release time. This example on a drum loop illustrates how this changed recovery behaviour gives a different movement to the breathing effect introduced by the heavy compression being used.
Gain reduction limiting - the ability to set a hard maximum to the amount of gain reduction being applied, isn't uncommon. It's found on the stock Avid Channel Strip and the Pro Compressor but in this case it is especially useful. When used in combination with Anti-Log release it allows the wanted, late recovery pump to be preserved while eliminating the deep gain reduction of the heavy compression.
Watch the video tutorial to see and hear this in practice.