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Some simple maths:
Mixing is adding channel amplitudes.
Uncorrelated signals add in power domain. That is, the signal power of the mix is the sum of both input signal powers. Speaking of Levels that results in a plus of about 3dB in mixlevel if both signals have the same power.
Correlated signals add in amplitude domain. For the mix level this means a plus of 6dB for two channels of equal amplitude.
Mixing several channel at about 0dB will raise your mix-level depending on signal structure between 3dB and 6dB each time you double the number of channels.
As you do not know about the actual signal structure you should calculate with a 6dB gain as peaks will occur at that level.
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