In one online linguistics community, I read the statement that "voicing is not all-or-nothing and that it is a gradient scale." This got me thinking: is this statement true or false? I guess it may be true, but I have no idea how.
If true, what about the "relative degree of voicing" between the consonants [z] and [d͡z]? Considering the definition of voicing, I would say that [z] is more voiced than [dz] because the vocal chords vibrate more in case of [z] than for [d͡z]. Is my opinion true? And also for what consonants do we see this phenomenon?