The first technique that we’ll cover is the Natural Harmonics. These occur at the 5th, 7th and 12th frets. To produce these tones, place your 4th finger (LH) directly over the fret wire at the aforementioned fret and pick the note. It should produce a chime-like ring sound. My composition “Four Souls” demonstrates natural harmonics. However, I capo at the 7th position but the rules are the same.
The following info does require some basic theory. Using the 6th string as a reference the 12th fret (E) harmonic is the octave to the open string and the 5th fret is the octave to that 12th fret harmonic. Also note that the 12th fret depressed is the same pitch as the 12th fret harmonic. (The 7th fret is the 5th scale degree to the 12th fret E.)
The harmonic at the seventh fret, as well as the 7th fret depressed, is the fifth scale degree of the 12th fret harmonic.
There are other harmonics that occur at odd places like 2/3rds between fret wires 1 and 2. I provide a chart that shows the majority of these "fractional harmonics" in the back of the Harmonics e book.
The capo being fret “0”, I use the natural harmonics that occur at frets 5, 7 and 12, counted up from the capo position.
I hope that this is helpful. Any comments are helpful to me.