Similar to Aux In, in fact, the hardware structure is the same as Aux In, which is the extra input line, but Aux Return is generally only found in mixers, multi-track recording equipment, and the emphasis is on Receive the effect sound processed by the external effector.
Aux Return is generally used in conjunction with Aux Send. On the mixer, the sound of each channel is sent out by the Aux Send terminal, and the external effector is used to process the sound (such as echo), and the processed sound is transmitted back. After receiving by the Aux Return terminal, the original sound is received. Mix together. The way the effects are used like this, we call it the Send-Return effect.
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