i've used automation instead of deessing, for example...
i mean, you could literally automate every single sound, but there's a point where your capture needs to be good enough to not have to ever do that...
then, you decide on an ARTISTIC reason to do automation...
from basic level control, to creating effects with simple fader rides....
automation, when i speak 'automation', usually i'm thinking very simple use:
1. Volume
2. Panning
on occasion, i'll do 'EFFECTS SEND' automation, just to bring, say, a reverb in and out.
but you can get crazy with automation.
when i mix, i get a good overall balance, and live with that for a while...
and eventually, every single track gets a volume envelope put on it, and i automate every track.
sometimes, like on a bass line, the automation envelope will remain a straight line throughout!
LOL
but, depending on the arrangment, if i have a quiet section, and i did not perform the bass line with the level of dynamics i really wanted, i'll simply bring the bass volume down for a section, and then bring it back up to the level it was to start.
but making music BREATHE........
is to me, the point of automation.
i can imagine, that the mixer wanted the toms to really stand out on signature fills, just like a mixer of days gone by, would have simply ridden the faders and pushed them up for that section, and brought them back down before the next vocal line started.