Thank you Jason for the links. I keep learning things on this forum that I didn't know I needed to, or wanted to learn about. Even after more than 40 years in electronic/audio repair I still enjoy finding out how the digital magic works. I haven't yet read all the info but will get round to it. Just a quick personal note Jason, I have to say that I enjoy reading your replies which are sometimes sarcastic but mostly helpful and 'spot on'..... dave