modulating
Webster's Dictionary (GCIDE)
Modulate \Mod"u*late\, v. t. [imp. & p. p. Modulated; p. pr. & vb. n. Modulating.] [L. modulatus, p. p. of modulari to measure, to modulate, fr. modulus a small measure, meter, melody, dim. of modus. See Mode.]
1.To form, as sound, to a certain key, or to a certain portion. [1913 Webster]
2.To vary or inflect in a natural, customary, or musical manner; as, the organs of speech modulate the voice in reading or speaking. [1913 Webster]
Could any person so modulate her voice as to deceive so many?— Broome.[1913 Webster]
3.(Electronics) To alter the amplitude, frequency, phase, or intensity of (the carrier wave of a radio signal) at intervals, so as to represent information to be conveyed by the signal; -- a technique used to convey information by means of radio waves transmitted by one electronic device and received by another. [WordNet 1.5]