fader
/ˈfeɪdər/
noun
- A control, such as a sliding knob or lever, used to adjust the volume or level of an audio signal, or to mix different audio channels.
- The DJ moved the fader up to increase the volume of the bass.
- He adjusted the fader on the mixing board to balance the vocals and the instruments.
- The sound technician used the fader to smoothly transition between two microphones.
Synonyms