modulate

Verb

• vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves)

• adjust the pitch, tone, or volume of

• fix or adjust the time, amount, degree, or rate of
  • regulate the temperature
    
  • modulate the pitch
    

• vary the pitch of one's speech

• change the key of, in music
  • modulate the melody
    

Related words

• Synonyms: 
  regulate , tone , inflect