I don't know for sure, but I doubt if compression as it is today was available when singers like Vaughn Monroe were popular. And, I was pretty much unaware of it until the 1980s, and I still do not use it. Now, I'll be the first to admit that I do NOT have the polished vocal abilities of Mel Torme, Tom Jones, or Inglebert, but I manage to get the job done and seem to always get lots of complements on my vocals.

Gary cool
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K+E=W (Knowledge Plus Experience = Wisdom.)