definition of
modulate

[1] #1 modulate v. change the key of, in music; "modulate the melody". wn

[2] #2 modulate v. [tone, inflect] vary the pitch of one's speech. wn

[3] #3 modulate v. [regulate] fix or adjust the time, amount, degree, or rate of; "regulate the temperature"; "modulate the pitch". wn

[4] #4 modulate v. adjust the pitch, tone, or volume of. wn

[5] #5 modulate v. vary the frequency, amplitude, phase, or other characteristic of (electromagnetic waves). wn