I LOOKED IN THE MANUAL AND THERE DOESNT SEEM TO BE AN EXPLANATION OF THE PRECISE EFFECT THAT EACH OF THE MIX MODES HAVE ,WHAT THEY ACTUALLY DO E.G ADD TOGETHER THE VALUES .
WHEN I USE THEM IT IS ALWAYS A BIT OF A TRIAL AND MANY OF THEM SEEM TO DO THE SAME THING IN THE SET UPS I HAVE.

ALSO , WHAT ABOUT HAVING MIX MODES IN THE MAIN OUTPUT BETWEEN A AND B ?

Having mixmodes between the fade of A and B is not so easy because the most mixmodes operate in a way where one content have to be the background and the other content have to be the foreground. So if you use the fade not just in one direction it would have curious effects if the definition of foregrozund and background content changes. I hope you understand what i mean.
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About a more detailed description i will forward this request to the docu team

Hi,

The user manual of MADRIX 2.14 now includes more detailed descriptions of mix modes. Please let us know if there are questions. Thanks!