MIXINGENGINEER
Mixing engineer
A mix engineer or mixing engineer is a person responsible for combining the different sonic elements of a piece of recorded music into a final version of a song . He or she mixes the elements of a recorded piece together to achieve a good balance of volume, while at the same time deciding other properties such as pan positioning, effects, and so on.The above text is a snippet from Wikipedia: Mixing engineer
and as such is available under the Creative Commons Attribution/Share-Alike License.