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  1. The main control over a number of other controls on a device. Most common example is on a mixer--each channel has a fader; there is also a master fader which controls the overall output of all the channel faders. The auxiliary sends function the same; each channel has an auxiliary control, but there's also a master auxiliary control. The master control is the final overall volume control on an output.
  2. In MIDI, a device that controls another (slave). Source: Church Audio & Acoustics Glossary

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