I just have examined if all what I reported about modules is correct.

So, it's actually was some effect with the A-116, but it was just another way of folding without any noise reduction. So' it's seems ok to keep any standard OpAmp there.

In the opposite way, I found one OP470 inside the A-106-6 (Oberheim Filter) and remembered that replacing the input OpAmp (right next to CEM3379) improved the dynamic range of the filter that make possible to increase input signal level that finally convertible into s/n ratio because of constant filter noise.