Tool plugin for output = leftchannel * rightchannel

[trackzone]

Do you know any tool plugin which calculates

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Output = square root of (left * right)

It can be useful for synchronisation analysis, where you would send original signal to left input of this plugin, the routed signal to right input, then playing around with track/plugin/clock/any type of midi delay parameters and should get an output only then if the synchronization between left and right is quite well.

So the multiplication operation should be done over a quite small windows, let us say 10 samples.

Any ideas or tips?