Any tuning technique will be useless unless your intonation is good. Tuning with 5th and 7th fret harmonics gives the best accuracy for most of the strings. The best way to check the G to B string is with chords. Single note runs don't provide the same opportunity to hear the dissonance that becomes obvious in a stroked chord.
Use the octave (12th fret) harmonic of the low E to bring in your high E. Tune the B to the high E using the 5th and 7th fret harmonics. Tune the G by alternately comparing the G to the B and then the D strings. Finally, play a D chord at the first position, and then a C. A bad 3-2 jump will stand out big time. When those chords sound good, move the D chord fingering up to the 7th fret and stroke them along with the open D string. If that holds up under scrutiny, try a few power chords, with heavy gain. The harmonics brought out by all that overdrive can really show up slight tuning errors.
By now, I think you can see why I get upset if someone even
looks like they're
thinling of tweaking my 12-string! To tune that baby, you have to do all of the above, and then apply a bit of 'octave stretch' to get just the right amount of warble.
Of course, by the third set of a bar gig, most of the audience is past noticing, or even caring, about such things, but
we know the difference,
don't we?
Lordathestrings
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