Mix engineer
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A mix engineer, also referred to as "mixer", is the person who, once the instruments, vocals, etc, are recorded, creates what's called the "final mix" or "mixdown" of the song. Hence the term "mix engineer". He takes all the elements that have been recorded on the multitrack machines and blends or mixes them together, getting the right balance of the instruments and vocals, equalization, reverb, etc. 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.