#1 modulate v. change the key of, in music; "modulate the melody". wn
#2 modulate v. [tone, inflect] vary the pitch of one's speech. wn
#3 modulate v. [regulate] fix or adjust the time, amount, degree, or rate of; "regulate the temperature"; "modulate the pitch". wn
#4 modulate v. adjust the pitch, tone, or volume of. wn
#5 modulate v. vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves). wn
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