Thanks. It's a long time since I did physics O level....

Well, I'm eternally grateful that someone has realised that I'm a
Physicist by training, and not an Audio Engineer. I've been meaning to
publish this fact for ages. I actually went over to the dark size, and
now I'm an IT professional in a large IT company. It pays better. The
Physics is somewhat rusty these days. You don't often need a high energy
particle physicist when playing with PCs.

--
Steve Swift
http://www.swiftys.org.uk/swifty.html
http://www.ringers.org.uk