I expected the toads to be around for a week or two, then to go away.
They stayed! The pond is close to our house and our neighbor's house. I even tried wearing headphones to bed and sleeping in a bedroom farther away from the pond.
Then I brought what I thought were female toads to the males to shut them up.
Finally I resorted to transporting the male toads to the nature center about a mile away.
The noise I was anticipating was the bullfrogs and the green frogs doing their calls. The green frogs have very short "burps". I am waiting for the bullfrogs to mature enough to start making noise.