Speaking of 12 string tuning ...

First, credit where credit is due because in reviewing some of the Chordie 'tips' posts, I came across a post by "Oilymike" made on 11-19-07 at 22:07:35 and he mentions the website get-tuned.com. This is golden! It's also free  and offers a wealth of ONLINE TUNING stringed instruments  ranging from the guitar to the violin to the cello, et al! All kinds of info to boot including alternate tunings but the plus side is that you simply identify your specific instrument [I tried it with my Fender 12 string], click the specific string with your mouse and the 'sound' of the string you're tuning will begin at 1 second intervals until you click it to stop. This avoids the old mouse start/stop repeat thing by 'continuously' sounding the string you're tuning until 'you' stop it. 

The website is get-tuned.com and here's the specific webpage for the 12 string tuning:

http://get-tuned.com/12_string_guitar_tuner.php

If for any reason the above click-through doesn't work, simply go to the get-tuned.com website and look to the left of the website page and click "ONLINE TUNERS" -- once there, pick your instrument [6 string, 12 string guitar as well as various other stringed instruments] and, voila, a picture of the instrument appears with the strings all labeled and all you have to do is click the box below the picture where you'll see the name of the string as illustrated and identified in the picture, listen to the repeated tones and tune up! Decidedly worth a gander!

Doc Tony   

What's that? Yeah, I use those electronic tuners too [IMT-500] or the classic 5th fret manual thing but sometimes on the electronic stuff that 'swinging needle', so to speak, can be a real drag to get spot-on or the 'green' OK indicator can 'vary' with the plucked string and so, if at home anyway and in front of your computer, hey, this website offers the in-tune "strings" one by one [quite handy for the 12 string or those new to the 12 string and the 'octave' tunings on certain strings] and all you do is click, listen and tune! Free! And no sign-in hassles. 

Get this -- I run into a player who loves the 12 string and says it's "the only way to go" and then I comment, "Yeah, but the 'one octave up' tunings on certain strings can be tricky ..." and so help me I get interrupted with  , "WHAT 'octave' tunings?" [!] Shows you once again , it boils down to 'whatever works' for each individual player.  But perhaps that explains 'alternative tunings' to begin with , yes?  Not to mention the old chestnut of "the rule is ... that there are really no rules."  Hey, switch to my piano for a moment and one sees literal 'tomes' written on "the vital importance of proper posture at the piano" [sic] and then watch vintage DVD's of Glenn Gould! So much for the "vital" issue of piano "posture"!  Can you believe [for those of you also into piano or the "keyboards"] Glenn's famous home-made folding chair [** made for him by his father when Glenn was a kid] and which he absolutely insisted using even during his concert recital days is presently under glass in a Canadian museum dedicated to "GG" [Glenn Gould] !