- To form, as sound, to a certain key, or to a certain
portion. - To vary or inflect in a natural, customary, or musical
manner; as, the organs of speech modulate the voice in reading or
speaking.
Meaning of 'modulate' (Princeton's WordNet)
1 . modulate
[ v]
Meaning (1): - change the key of, in music
Example in sentence:
modulate the melody
Meaning (2): - fix or adjust the time, amount, degree, or rate of