Mix engineer
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A mix engineer, also referred to as "mixer", is a person who, once all instruments, voices, etc, have been recorded, creates what's called the "final mix" or "mixdown" of a song. Hence the term "mix engineer". He or she takes all the elements that have been recorded, and 'blends' or 'mixes' them together, with the aim of achieving a good balance of the instruments and vocal volumes, as well as improving sound quality through various artificial enhancing methods such as equalization, reverb, and other effects. Also see Audio mixing.
A more technical definition: an audio engineer in sound recording, audio editing and sound systems who balances the relative volume and frequency content of a number of sound sources. Typically, these sound sources are the different musical instruments in a band or vocalists, the sections of an orchestra and so on.