How do we create reverb effects?

There’s only sparse documentation on these on Unreal. UE3 came with a bunch of pre-sets but there’s nothing in UE4.

I’m wondering, does the engine use Impulse Responses? Or do you program in the effects of the Reverb yourself? Option #1 seems more accurate but #2 seems more likely…

Seems like Option #2 is the way to go. at least i could not find a way to add an IR in the Reverb Parameters.