modulation

definition: the act of modifying or adjusting according to due measure and proportion (as with regard to artistic effect)
example:
speech part: noun
synonyms:
definition: in electronics, the transmission of a signal by using it to vary a carrier wave
example: The modulation failed.
speech part: noun
synonyms:
definition: a manner of speaking in which the loudness or pitch or tone of the voice is modified
example:
speech part: noun
synonyms: inflection
definition: rise and fall of the voice pitch
example:
speech part: noun
synonyms: intonation pitch contour
definition: a musical passage moving from one key to another
example:
speech part: noun
synonyms: transition

How modulation is being used?