Steve (Handymann), I think you may be referring to hyperacusis. And to posts by member "Giri," a neurologist who mentioned that disorder in two posts in the following thread:
https://forum.audiogon.com/discussions/my-music-sounds-brighter
Best regards,
-- Al
https://forum.audiogon.com/discussions/my-music-sounds-brighter
Best regards,
-- Al