"modulate" in the verb sense
change the key of, in music
"modulate the melody"
2. tone, inflect, modulate
vary the pitch of one's speech
3. regulate, modulate
fix or adjust the time, amount, degree, or rate of
"regulate the temperature"
"modulate the pitch"
adjust the pitch, tone, or volume of
vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)
Source: WordNet® (An amazing lexical database of English)
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