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1. EQ Processing: Equalization allows the engineer to adjust specific frequencies, either boosting or cutting them to alter the overall tone of a track. This function is critical for making various tracks sound cohesive and for ensuring that they sit properly within a mix.

2. Level Control: This is perhaps the most basic yet important function of a mixer console. It involves controlling the volume of individual tracks and is crucial for balancing a mix. This is typically done using faders on the console.

3. Auxiliary Send Control: Auxiliary sends allow an engineer to route a signal from any channel to an external processor or to a mix bus for effects like reverb or delay. This function is vital for adding depth and interest to a mix.