Sound generator MAY be helping. The rate of plucking seems to have abated or at least slowed. What is mildly surprising is how easily Salty has taken to an adjusted diet. We know parrots hate change, especially with food. After a day or two of not eating much, he has shifted his main interest to his chop in the evenings. Salty used to waste a lot and would leave some in the bowl. Now, judging by whats on the bottom of his feeding station and what is left in the food bowl, he is eating a lot of it, which is good! And he has started to eat more of the pellets he has access to all day. Both were recommendations of the vet - not viz a vie the plucking but because he is a chunky boy.