In Endnote (Export), there was some muddling of fields....In BibTeX, there was also some muddling of fields
In none of the above were my extensive research notes picked up.
They all just ignored them, except for the Refer export format. This picked up a portion of the research notes and put them into the 'Extra' field. However, it cut off after a certain amount of text. It doesn't recognise URLs, but this still seemed to me to export the most data successfully and correctly.