The biggest irony for mix engineers is that mixing songs is not really about "mixing" at all. In fact, it's often more about creating separation and unique space between tracks than it is about mixing things into one homogenous mush of sound.
Fab Dupont demos the Oxford SuprEsser plug-in, first using it to de-ess a vocal and then to compress resonate frequencies of a double bass. (Filmed on the Sonnox booth at the Musikmesse show in Frankfurt.)