modulator
n. countable C1 Advanced US //ˈmɑdʒəˌɫeɪtɝ// UK //mˈɒdjʊlˌeɪtɐ// mod·u·la·tor
n. a person who changes or controls the way something works. In music, it is often a person who adjusts the speed or volume of a performance.
n. a person or device that controls or alters the characteristics of a signal or process. In a musical context, it refers to an individual who adjusts the tempo or intensity of a performance.
The modulator adjusted the tempo to match the dancer's movements.
During the live broadcast, the technician acted as a modulator, fine-tuning the audio levels to ensure the audience heard every word clearly.
In the context of electronic music, a modulator can be a hardware unit that alters the frequency or amplitude of a sound wave to create complex, evolving textures.
From modulate + -or.