This is not possible with a normal send effect. Take Plateau on AuxA for example, with 16 tracks using it though sends. The stereo pair output of Plateau has all the effects of the 16 tracks implicitly mixed in its outputs, and it’s impossible to have each wet aux effect isolated for each track. The way to get what you want would be to have 16 Plateaus, in this example, on each track, and not use a send effect.
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