dnoise(1) on Linux
The text 021e1995e28e, as Debian 4.0 (Etch), Debian 3.1 (Sarge) shipped it.
reduces noise in a soundfile
Flags it lists
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-- -
-8 -
-A -
-B -
-D -
-E -
-H -
-J -
-L -
-M -
-N -
-R -
-V -
-W -
-a -
-b -
-c -
-e -
-f -
-h -
-l -
-m -
-n -
-s -
-t -
-u