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The gain is shared,you only have one analogue pre amp. either one surface retains control of the analogue gain while the other uses the Trim control which I believe is + and – 24dB of digital gain, or, my preference is once the gains are roughly set then each surface swaps to trim mode that way no unexpected gain changes occur affecting both surfaces.
Lots of people complain about the lack of gain tracking etc, however never found it a problem so far in the last 5 years or so. I think the only true separate system is on the Midas XL8 but I am sure I will be corrected on that.