How to reduce channels' number of samples?

Hi there,
this is a very beginner one, I guess.

Two channels.
I want to use the mean of each one, and to create a 2x1 texture according to these 2 means previously calculated (basically to color 2 instances of something)

How would you do this ?

I’m okay for merging, almost for shuffling (here I want to have the first channel joined to the second one, as an only one in the end) etc.

I did that, it seems ok in that particular case (using rms power analysis)

BUT I’m interested by an answer in more global case:
you got a channels with n-samples, how to calculate a mean for instance, or something and to “reduce” it to one value ?

Shuffle CHOP (split all samples ) into a math CHOP and set combine channels to average ?

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