@Openmastering The mix is performed with a Neve 8816S, a 16 tracks inline summing mixer, "powered" by the legendary Neve's "St Peters Carnhill" circuitry (which is the circuitry from the no less legendary 48 tracks Neve 88RS)
Every "similar" sections are merge in busses (drums, bass, guitars, voices...) and sent in the 8816 for the mix.
Sorry for the "book" 
and many thanks to @Openmastering to offer this share place 