When I mix, I mix in sections then edit the sections together as I go so I don't do 'automation' as such, but it enables me to mix as dynamically as I desire at that given moment. I use 2 standalone DAWs and I've always laughingly referred to my system as 'poor man's automation'.
From when I started writing songs back in late1981 right up until the summers of 2010 and 2011, the majority of my songs were long. Many of them were born in jam sessions and because I used to tape any jam I was involved in, I'd often find long sections that fitted really well together and many songs were born that way. By the time the 90s rolled around and I was actively recording these pieces {with lyrics added and other instruments}, I hadn't given much thought to the actual mixing of them until I was teaching myself how to mix with nothing but a portastudio manual showing how the portastudio worked and a lot of hit and miss guesswork. The double whammy was that in those internet-less days, I'd pick up on the odd phrase of a producer and have to try and work out what they meant ~ to this day, I still don't understand what was meant half the time ! The other thing was that portastudio {or DAW} manuals don't teach one how to mix. They simply show you how the machine works.
So I was on my lonesome. And when you don't know what you're doing and you're recording and mixing 9, 14, 22 minute pieces on a cassette portastudio, you fly by the seat of your pants. It might not have been so bad if I was just a two guitars, bass and drums guy but no. I knew a few people that played different instruments and I always had in mind to incorporate whatever I could into my songs. There was the added complication of having only 8 tracks but I did a lot of double tracking, bouncing and whatnot so that meant track sharing.
When I'd be mixing, everything would have to be done as a single performance which of course meant that any mistakes and I'm having to start over ! It's hard enough on a 3 minute piece with a voice and 3 instruments. And there were few things more discouraging than getting to the end of a 15 minute song only to discover I'd botched the fade at the end or missed the opening note of an instrumental phrase in the 7th minute or a vocal was too loud for a syllable in an important spot in the 10th minute or whatever ! Mixing for me was more tense than turbulence in an aeroplane {I'm not a fan of flying !}. I suppose I could have done what Ken Scott used to do with David Bowie's albums that he produced and done them in sections then edited them together but no way was I risking cutting tape, no sir ! I did get better as time went on but some of those early mixes are atrocious. The weird thing is that some weren't at all bad but that was my problem, such inconsistency and not a clue how to solve most of the problems that cropped up.
After 12 years of mixing like this, I started looking into going the digital route. Although people had said 'go diji' for a while, I wasn't interested in computers but that all changed in 2004 when I simultaneously discovered the existence of VSTIs, electric drums and computer music. I misunderstood what I read about mixing digitally because I was under the impression that I could mix in sections and that this was this priceless concept called 'automation'. I figured that I could mix a little bit of a song, get it to exactly how I liked it, then save it, move to the next little bit, get that exactly how I wanted it and move to the next bit etc. But when I bought a DAW, I discovered that it wasn't like that ! Certainly not if I wanted to use all the tracks.
In 2010, having been using my DAW for less than a year, I was walking past an instrument exchange in Hammersmith and I saw an identical model of my DAW in the shop window and on a whim, just bought it. Initially I bought it just to have a back-up machine but before I got home my mind was ticking over and I thought to myself that if I connected the outputs of my DAW to the inputs of this one, there'd be no reason why I couldn't use this one as the mixdown deck.
And that meant I could mix in sections. Although by 2010 my Akai DPS 12i was already ancient history and obsolete, it had copy, paste, insert, move, discard and all the other editing features that DAWs boast {except reverse, but that was not a deal breaker}. The move function meant that I could join two pieces of data together seamlessly which confirmed that I could mix in sections and 'poor man's automation' was born !
So that's what I do. I'll take small sections and listen carefully, work out where to raise or lower a fader for emphasis or slight ducking or a pan pot for a bit of movement or an effect or whatever it may be. Before "If only for a moment" was my strapline, it was "Digital is my razorblade" because digital recording and mixing enables me to do what engineers used to do when there was only analog and they'd edit songs together by cutting the tape and joining it to another piece of tape.
I suppose it would be easier to be able to just programme in any changes I might want to make but I don't have a problem with doing it as I go along. And making changes to a section that might be anything from 8 seconds to 58 seconds is a heck of a lot easier than having to execute a 22 minute song with lots of level changes and track sharing and different sets of panning with no margin for error so I'm not complaining !