Have you been spending less time with him? Covering him up to keep hime quite is not the answer ( even though it may work for you, think about what message it sends to your rocky. When he is quite on his own, thats the time to spend time with him, one on one, With lots of treats. Instead of covering him when he gets loud, a short time out, where he is put on a stand or chair back , for a few min, will let him know that screaming gets LESS attention. Dont use his cage as a time out, that should be his refuge not a isolation booth! Be consistent in your chosen method. Senigals can be the picture of stubborness ( i know someone who has one, and her B/F near;y ruined him, becasue as soon as he came home, he put the bird in the cage with the cover on. She wrked with the both o them, and the Sennie is much better all around now. Hang in there!