Thanks Werner.
Sunday afternoon success post.
A few years ago I had built a circuit to fade the Led's in the signal in and out.
Never got it to work correctly, gave up and left it lying in the cupboard.
Well I need this, so decide before I sit down and redesign this again from scratch let me
try and see where I went wrong.
I had one of the transistors the wrong way around.

Now it works perfectly.

Now I need to make a few more.