Synonyms for Modulation (same or very similar meaning)
WordNet sense 1 (a musical passage moving from one key to another):
transitionWordNet sense 2 (rise and fall of the voice pitch):
intonation, pitch contourWordNet sense 3 (a manner of speaking in which the loudness or pitch or tone of the voice is modified):
inflectionFrom the ODE community, based on WordNetadd/edit