Never been myself but I've spoken to three separate investigators who all reported the same thing independently - a child's laughter on the fourth floor that doesn't show up on any audio recording but multiple people in the same room hear it simultaneously. That pattern interests me far more than the usual EVP stuff.
Did you get anything on camera? I do a lot of paranormal photography and I'm curious whether the visual phenomena there tend to cluster around specific areas or whether its more scattered throughout the building. The body chute in particular seems like it would be magnetically charged given the sheer volume of death associated with it.
What drew you to Waverly in the first place? Just the reputation or did something specific pull you there?