modulator

Noun

1. A person who modulates.

   Coordinate Terms: regulator mediator arbitrator

2. A device or thing that modulates.
   • [Poetry] is a most musicall Modulator of all Intelligibles by her inventive Variations, undulling their Grossenesse, and subliming it into more refined Acceptablenesse to our own, or others understandings. - 1654,...

   Coordinate Terms: regulator attenuator governor synchronizer

3. A chart in the tonic sol-fa notation on which the modulations or changes from one scale to another are shown by the relative position of the notes.