What is an Aux Send?

An aux send, short for auxiliary send, is a control on a mixing console or digital audio workstation that routes a portion of a channel’s audio signal to another destination, such as an effects processor or monitor mix.

Aux sends allow engineers to send part of a signal to external or internal effects like reverb, delay, or chorus without affecting the main channel signal. The amount of audio sent can be adjusted independently from the channel’s main volume level.

Aux sends are also commonly used to create monitor or headphone mixes for performers during recording or live performances. This allows different performers to hear customized mixes while the main mix for the audience or recording remains unchanged.