When you first learn how to use a mixing console, you will be shown how to set the gain. Your instructor - either in audio school or in the workplace - will emphasize the importance of this and kick your ass every time you get it wrong, until you can't do anything other than get it right.Setting the gain correctly optimizes the signal level for further processing in the mixing console. EQ, inserts, auxiliary sends, routing, fading, solo and mixing all depend on having the right signal level for .