Oedipus (Tyrannus/Rex) and the Chorus.

I'm writing an essay about the impact the Chorus has on the audience and have been looking at the roles it plays.
I have all the obvious things like creating empathy, responding to action, offering advice, affecting the tempo, irony, foreboding, their moral standards and things like that.
But I was wondering if there is anything else that I might have missed. Something less obvious or even something slightly controversial.

Any thoughts?

Thanks.