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Hi Carey

Yes, you would have to be careful.
There are two ways you could do it…

Either be able to mix the output of an Aux to the input of another one which I think could be dangerous but extremely handy.
Be able to patch the output of an aux to an input which could then go anywhere.

In either case, you could use the routing screen to prevent accidents and by default I would expect that it would be set so you could not route an aux back on itself.

It should be something you explicitly turn on.