Serge,
My experience is that one of the master volumes saves per song and the other does not (it remains a universal setting).
Knowing this I can usually get the response I want/expect. Personally I never move the master slider located between the tracks and the outputs (#1 in image below), but rather make adjustments on the Audio Out master (#2 in image below), as these do save per song. At least for me.
Hope that helps


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