The Collaborative International Dictionary of English v.0.48:
Modulator \Mod"u*la`tor\, n. [L.]
One who, or that which, modulates. --Denham.
[1913 Webster]
Moby Thesaurus II by Grady Ward, 1.0:
26 Moby Thesaurus words for "modulator":
alleviative, alleviator, anodyne, assuager, balm, calmative,
cushion, dolorifuge, lenitive, mitigator, moderator, mollifier,
pacificator, pacifier, palliative, peacemaker, restraining hand,
salve, sedative, shock absorber, soother, soothing syrup,
stabilizer, temperer, tranquilizer, wiser head