Hi rkl122 - or can I call you rkl?

thanks for that. Back in the 1960's my father was a audio and computer geek - though the term hadnt been coined yet. Computers were house sized then - long gone now, like him.

He bought a new hi-fi and spent hours testing it with a scope and checking the frequency response curves and stuff. I couldnt figure out why he didnt just get on and play some music on it.

I guess I'm just the same - you're right - I need to get stuck in.

Still have some more questions though.