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@@makeediblemusic actually the principal of compression stages in a production. I always hear in professional tracks a lot of pressure and cohesion. Maybe it's because the groups and parallel processing of groups...it can't be done with one compressor that's for sure.
You're definitely on the right track when thinking about group- and parallel processing. And those are in addition to individual channel processing, plus compression and limiting during the mastering stage. It's compression galore, though they're applied differently at each stage