Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
mŏdŭlātor, ōris, m. [modulor], one who measures by rule, a director of music, a musician (poet. and post-Aug. prose).
Absol.: optimus est modulator, Hor. S. 1, 3, 130: vocis et cantūs, Col. 1 prooem. § 3.