I'm familiar with music theory and microtonal music and the first examples are just too close to really discern easily. The examples of "chord 1/2" in the secti

I'm familiar with music theory and microtonal music and the first examples are just too close to really discern easily. The examples of "chord 1/2" in the section "The Far-Out Solution: Freestyle JI" are probably the first example that makes the difference clear, if you play the 12TET and the JI overlapping slightly. That's because subtle differences in tuning are much more perceptible in harmony (chords) than in melody (single notes), since notes playing together are perceived with noticeable effects introduced by our brains such as harmonic beating and feeling tone.