An “Aux Send” is a type of output used on most live sound and recording mixers. It allows you to create an “auxiliary” mix in which you have individual level control over each input channel on your mixer to your “Aux Send” output. The aux sends on a mixer work independently of the main mix output and give you the ability to route multiple input channels to a single output while leaving out the channels you don’t want to hear.
Aux Sends have many uses, including:
Creating monitor or headphone mixes so that performers are able to hear themselves during a live performance or recording.
Sending signals to some sort of effects processor (reverb, delay, compressor, etc.). Typically, the output of the effects processor will be brought back to a stereo or aux return on the mixer. This allows you to add those effects to an output or channel on your mixer.
Sending only certain channels into a recording interface. This is useful when overdubbing.
Creating a submix.
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