I take out my cockatiels out one at a time for individual attention. This takes about 6.5 hours a day. Unfortunately when I take one from the other three they start there alert call. Makes it completely impossible to talk on the phone. So I bought a soundproofing blanket and hung it from the ceiling right by there cage. It reduced there loudness by almost 30 decibels. It cost about 100 dollars. The neighbors said they can't hear them any more. The coyotes nesting in there back yard make more noise than my birds ever did so they never minded my birds noise anyway. I'm going buy a quilt to hang in front of the blanket so It looks nice. Anyway, for 200 dollars you can reduce your birds noise by 50%. If you don't have the cash cheap egg crate foam works well too. I've been told by people experienced in parrot keeping NOT to react in any way to biting and screaming so as not to reinforce the behavior. I'm planning on getting a muloccan cockatoo and have been told they are one of the loudest creatures on the planet. I want to minimize the noise pollution to the neighbors but still want my birds to be able to look outside. I found that a double pained window filled with a lighter density gas will minimize the noise. In all I'm spending around a grand to minimize the noise. I don't mind the expense since it's a one time investment and I get to upgrade my windows. I've found the french country style to be very effective in sound management. Yea me!