Definitions from Wiktionary ( )

▸ verb:  (transitive) To regulate, adjust or adapt
▸ verb:  (transitive) To change the pitch, intensity or tone of one's voice or of a musical instrument
▸ verb:  (transitive, electronics) to vary the amplitude, frequency or phase of a carrier wave in proportion to the amplitude etc of a source wave (such as speech or music)
▸ verb:  (intransitive, music) to move from one key or tonality to another, especially by using a chord progression

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