What effect(s) make(s) this piece of audio that one?

Hello.

You might expect a lot of posts from me about pretty much the same things, or not.

Anyway, I’m recreating a bunch of voices that use various effects all done in Audacity and I have some of the source files (or close enough) but there are some ones where I don’t know the effects they need. I only really know what common effects do - either that or I have some idea what things do but have no idea what any of the variables do.

Here’s the one I’m trying to recreate.

I think we need only one effect to get to this one but what is it?