Audible pre echo, cool topic.
In the afore mentioned thread I was wondering how long it was going to be before somebody referenced "Whole Lotta Love?" At this point it would seem artificial if we didn’t hear it. Less organic not authentic. Our brains and conscious would dismiss it.
To answer the question of was the pre echo intentional or not on Whole Lotta Love? It’s a totally cool effect and it would seem that it was done on purpose. But if it wasn’t, all of the details that came together in that moment kind of reminds me of golf getting a hole in one; just perfect.