Our Monti is a loud bird. He screams when he hears somebody in the house. We have wooden foor, and when you move upstairs, he can hear. Than it used to start. I always said from upstairs " Monti Ruhe" which means " Monti silence!". What he does now, he says " Silence" and the 3 other two. As soon as one of them is getting louder the others call " Silence". My answer ist always "GOOOOD, Birds!". For a while it was nerv killing, but now - they learned.
It works fine here. They still have their loud periods, but nothing compared to what it was. When I go past the aviary, and they are loud, I do not even look at them. When they talk and or are quiet,
than I speak to them, give them a reward. It takes time, but it works. If you would always go to them and talk, than the birds think " Oh great, I must scream, be loud, and somebody will turn up" I would not do it.
rgds, Don + Karin