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It's a D6th tuning, like the standard C6th moved up a step. RKR shifts it to a Gadd9, which is like strings 4 through 11 of a U-12 moved up from E to G. Here's what each of the pedals maps to in the standard tunings:
[tab] C6 E9
LKL C-C#
LKV C-B Bb lever
LKR F lever
P1 B pedal
P2 A pedal
P3 P5
P4 P7
P5 P8
RKL P6 D string
RKR E lower lever reversed[/tab]
Also, RKR makes the dobro G open strings available, and P2+P3 opens up the E major blues/rock licks and power chords.
It remains to be seen whether this old brain can switch from Emmons to Day pedal order, and from E to G for the E9th licks. I might fall on my ass with this, but I think it will be fun ride anyway.
Chuck Back of Desert Rose Guitars is building me a custom instrument, which should be ready in July sometime.
Some U-12 players like to describe their copedent as "one big tuning". This is sort of like the core of the U-12 in one little tuning.