did they mention that you can cheat this when e.g. singing, by changing pitch dynamically to fit the chords you are working with? In theory, a synthesizer or

did they mention that you can cheat this when e.g. singing, by changing pitch dynamically to fit the chords you are working with? In theory, a synthesizer or sound card could do the same. Of course, this could have other undesirable side effects. Maybe this was implied by the "just tuning"?