Ah yes, it makes sense when put that way. (Yet most of the time in a melody, a note that is outside the scale doesn't much sound as an inflection but as "wrong"

Ah yes, it makes sense when put that way. (Yet most of the time in a melody, a note that is outside the scale doesn't much sound as an inflection but as "wrong". Whereas a small vibrato (oscillating around the proper pitch without going too far away) feels more like a true modulation. And a portamento can make use of frequencies that aren't even in the chromatic scale at all.)