Ok now let me start by saying I still have to get a good tuner...just have the d'addario clip on and a snark. So I set my intonation to 12th harmonic yesterday and I could tell it sounded out of tune down there on the G string. anyway the 12th harmonic sounds and reads perfectly in tune but if I play a fretted 12th fret G it sounds and is way out of tune almost a half note! how can the 12th fret harmonic be in tune and the 12th fretted note isnt? should I set the intonation to the 12th fretted note?