I think I have now learnt what I did, or did not do. It's very difficult to explain to someone something you don't know? The VST box must be checked if I use a VST! and not an output driver. So I set the output driver to no midi output. Then I learnt that using a VST requires that it must not be empty. I must select an instrument from the VST interface. I loaded a midi style and generated a melody. Saved it as an MP3, and, fingers crossed, it sounds the same as the MGU file.
Now I am back to my very original problem but at least now I know what to ask. Where do I get decent sounds that work with the VST's I have. The VST's that work at present are szorfando which seems to contain very few instruments, and synktronic, which has many sounds, but all are synths and no traditional instruments it seems. So how do I go about finding a nice mellow cello or glitzy, brassy sax?
You guys have been great in guiding me sofar and I am most grateful (or is that greatful?)