Are the settings variable in terms of attack, hang, and decay?
In the menu, you can set the following parameters for AGC: Pulse (noise pulse rejection), Hold (Hang) time, Decay (in dB/sec for Fast and Slow), Threshold, and Slope. Slope sets the compression you get from AGC, whether you like everything above the threshold to be flat (S4 and 40 over S9 are the same level) or some sort of slope (2:1, 10:1 whatever) so stronger signals are somewhat louder.