I worked at Detroit's all-newser, WWJ/950, in the mid/late 80s, and they still
had the teletype sound running in the background. I believe it was on a
continuous loop mechanism, likely the same variety that was used at CKLW/800 in
its 20/20 News heyday.

WWJ remains all news, but the teletype sound was dumped years ago.

John Z
Detroit