Sycraft
Anderton
Because no one has yet defined what "do this" is. So far it has mostly been defined as "do VCA automation."
I think that may be all there is to it. People have heard the buzzword and they want it. They aren't particularly sure why they want it, they just want it because it is something newish to DAWs, is featured in Pro Tools (which is popular for reasons beyond my understanding) and hearkens back to the glory days of analogue consoles which is the hot thing lately. I don't think there is many, if any, cases of someone saying "I need to be able to do X in my DAW and I can't, however I can do it in a DAW that has VCA faders."
I kinda feel like Cakewalk should just implement it if it isn't too much effort just because it'll make people happy to have the feature. Not that it is useful, but they'll be happy because they have the cool new feature that everything else has.
Some truth in what you say, of course.
I see a daw as having tools that assist you to do many things in a simpler fashion. Daw with no VCA's: Move or automate a fader to go from 0dB to -8dB - you also have to adjust a possible send to get the same sound, unless a different ratio dry/wet is the effect you are going for.
Control group still have to adjust all sends on affected tracks manually to sound the same but different level only.
If there is one such jump in level, you can calculate a ratio for send level adjustment for that. But if two or more such changes in a mix, or a slope curve of some sort you are screwed.
So which ratio is to be used for volume instant change from 0DB to -8dB?
Needs to be done for each such change, on every track individually.
Careful planning with routing through busses for both dry and returns from wet busses - can let you automate buss fader.
It's common you can get away with maybe 8-10 stems in a project, parts that may need individual adjustments through out a mix. The amount of planning of routing, and duplicating the same effect to return wet signal to the same buss is growing rather quickly.
Daw with VCA: Move or automate a fader to go from 0dB to -8dB - do that on a VCA fader and it takes care of sends adjusted to sound the same. One track, or 100 tracks affected, belonging to that VCA group.
Nested VCA also adjust other VCA's affected tracks. And your project can stay pretty flat when it comes to routing and busses.
VCA is basically a global offset automation for any range of tracks and busses. It need not handle any audio at all - just automation. This is how I see it.
Not needed for every song or piece of music - but nice if it is there if you need it -
I call it headroom in my tool.