Circle of 12 tones

Same color=same group

"I tune the top neck D G C F A D, and the bottom neck A E A D F# B. I also use the bottom neck to write most of the tunes for 'Machinations Of Dementia', which has almost all songs tuned to low A. "
-Ron, on the red doubleneck.

Although Ron should clarify anything I say, he may have changed things since.