Cool Edit Pro
Used by 2 peopleen.wikipedia.org ↗

“I use Cool Edit Pro for sound file work.”
Jennifer Reitz Interview, Game designer, illustrator · via Uses This 
“For multi-track audio and other audio editing, I still use CoolEdit Pro 2.0, which was bought by Adobe and now called Adobe Audition -- the main difference was that Adobe added a bunch of bugs, and made it more expensive.”
Mitch Altman Interview, Inventor · via Uses This