I have repeated the tests with the 1K input resistor followed by the 10K side chain pot as the top arm of the gain cell. With the pot at the 1K resistor end the curve is almost identical to the limit curve I got last time. This looks still to be mostly feed forward as evidenced by the dip in output level during the limit part of the curve. The pot turned so the side chain take of it at the signal output gives the same 2:1 curve we got before. So far nothing new. So, at the maximum input point I adjusted the ratio pot for 0dB output to put the ratio somewhere between limit and 2:1 ratio. I still do not have a handle on how ratio changes with pot position so this was just a stab in the dark. Here are the results:

I have tweaked the input scale so that all the lines go through the same origin at -10., -10 which make it easirer to compare them with 1:1. The green line represents 1:1, the red line the 2:1 ratio and the blue is the near feed forward still with the dip in the output and running out of gain reduction or headroom at the highest input levels. The yellow line is the new shot in the dark curve which is remarkably asymptotic to a ratio of 10:1 and looks to be very well controlled.. So I quickly turned off and measured the actual resistance values with the pot in this position. The values were as shown in the graph; 7K2 from input to tap off point and 4K7 from tap off point to output. The total resistance is higher than the previous 11K2 because the pot on its own is actually over 10K.

We know from prior test that8K2 and 3K gives a ratio approaching 5:1 so it looks like we have three points on the graph describing ratio versus pot position:

A graph with three points on it is not very convincing unless they happened to be in a straight line which they are not, Given that all of the curves have a fairly gentle knee such that the ratio gradually climbs to the final value, there does not seem to be a lot of point having lots of selectable ratios. For the moment I am happy to have 10:1, 5:1 and 2:1.

Cheers

Ian