I don't have it open in front of now, but I selected from a dropdown and from memory I can't recall seeing guitar but there was Mic 1, Mic 2, Mic Stereo and at least two other options which I presumed were for the jack inputs. Anyhow, I selected the other options with the guitar but nothing. I think I might need a replacement unit which sucks 'cause I bought it online !
Thanks for the suggestion though.
Daz