An equalizer can be used to give you control over different parts of the frequency spectrum, independently allowing you to make character or corrective alterations by applying additive EQ or subtractive EQ
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Vocal contrast: give the vocals a 1⁄4 note or an 1/8 note delay. When the chorus hits, change it to a 1⁄2 note delay and turn up the feedback a little bit. The vocal will have more depth in the chorus. Back off the high end with an EQ to create depth without the obvious echos.