Thanks for that,
I have done what you said and managed to get a graph. I find a lot of the technical aspects a bit over my head and the help files are so detailed i can get a little lost. If i stick to, red plug to red socket we will get there.
adjusting the volume, as i cant hear anything i adjusted the sweep level until the spl figure on the screen was 75, then i adjusted the input level until the bar was at 18, this brought the spl figure on the screen up to about 78, however the input lervel is very low, if i drop it any more it will be doing nothing. Thescreen shot shows what is there
the graph i managed to make
