The sound is hard to explain. It is just a loud clicking noise. It isn't the loud screeching when he plays, but it isn't too pleasant to the ears.
I have had Darwin for 3 years, my daughter had him for 2 years before that, and one of the managers at a PetSmart had him in her home before that. He spends most of the day on top of his cage when I am home. He doesn't play with his toys much, but as I said, is a very talkative bird. Sings, repeats things in context, tells me exactly what he wants for dinner, etc. We went through a few months where I had to give him antibiotics 2X a day because of an infection which probably explains his hesitance to be loving. He does, however, take to 2 or 3 of my friends. Thanks for the prompt answer. Is this enough background?