What I learned is to balance everything so 200 hertz is the same db as 8.0khz, even if the resolution of the tracks only allows for 4 samples of the low end and half a sample of the high end per second.
I am happy to mix tracks so they sound exactly like everything else on the worlds 'leading' streaming poney up the money music services.
All I do is in the box, I only work with reaper, because I very much dislike every other D.A.W.
Editing: splicing a track to get rid of fuzz when there's no sound but the background of de microphone (because noisegates just seem to artificial), or cutting out extra noise (like a cough or a fart), just editing in general
Adding harmonics/resonance/presence/size/oommphh to tracks with lots of neat processing.
Time stamping, changing pitch, distortion, eqs, comp, etc etc.
Mixing: Panning a subtle echo of an acoustic guitar far right while the drums are straight in the center with de bass on the right side...and making sure everything is as loud as it should be.
Mastering, adding a compression, to follow the whole -4db volume before the chorus/drop/ than either blast the volume to +1000000 dbs on the chorus or whatever.
Also, rendering the mix to .ogg or .ac3, or ... .mp3 :(
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