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The loudness buttons were more to equalize than to affect the dynamic range.

At lower volumes, we perceive mid-range frequencies to be more prominent than at higher volumes. The loudness buttons would add lows and highs and/or lower mids so that the music would "sound better" at lower volumes.

https://ehomerecordingstudio.com/fletcher-munson-curve/




Moreover, stereos had this in 1980 and probably a lot earlier.




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