I thought I would share my findings after analysing what I believed I was hearing with the 1176s, and what is not specified within the manual...
As you know, sometimes we require softer compression over a wider range and other times harder compression over a narrower range. Of course, this is achieved with threshold and ratio settings but one must also consider the knee of the compressor.
The 1176 does not possess an adjustable knee parameter, like Pro C2 but the knee does get harder the higher the ratio.
For this analysis I adjusted the input of the 1176 at 20:1 ratio so that the source signal was just under the threshold.
Next, I simply changed the ratio, all other parameters remain the same, most importantly the input gain. The results can therefore only be as a consequence of softer knee settings.