Re: Tuning 12 strings from low to high.
Big George Waters and all, to be clear i should mention i'm responding to an old thread, in case jodeen is still around (i now see they may not be) and because the subject interests me.
I know that Garry Goodman of O4P experiments with more extreme strings than they list on the website, so perhaps that Warr has/had an experimental Ab4 string.
Garry has reached G4 on 34" before now, on a triple-octave triple-course 12 string:
https://www.youtube.com/watch?v=Umw3LGc0keM