I am searching everywhere for this information. This looks like a well-informed group, so here goes. Leadbelly tuned his 12-string well below standard pitch (E). I have heard he tuned to C# and I have also heard to B. What gauge were the strings he used? I have heard he tuned the 5th and 6th string in unison and the 11th and 12th two octaves apart. Any information would be greatly appreciated.