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.

2. To vary or inflect in a natural, customary, or musical manner; as, the organs of speech modulate the voice in reading or speaking.

Could any person so modulate her voice as to deceive so many?

Mod"u*late, v. i. (Mus.) To pass from one key into another.

• to regulate, adjust or adapt
  
• to change the pitch, intensity or tone of one's tone or of a musical instrument
  
• (electronics) to vary the amplitude, frequency or phase of a carrier wave in proportion to the amplitude etc of a source wave (such as speech or music)
  
• (music) to move from one key or tonality to another, especially by using a chord progression