I tune my 12 string to a C# (standard tuning) which, if nothing else,seems to please to top of the guitar. I also have a Guild Jumbo that I keep tuned down 2 steps to a D (again standard tuning) with medium guage strings. Among other things, this opens a whole new world of songs as many do not lend themselves to transposing the chords...in other words, I use it as a negative capo.