GoldWave
From Super-wiki
From the Pad of Definitions
From 1.01 Pilot
A professional digital audio editor. Among other things, the program can be used to digitally remaster and restore old recordings with noise reduction and pop/click filters, and to analyze human and animal voices.
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Quote
Dean: I slowed the message down, and ran it through a Gold Wave, took out the hiss, and this is what I got. Pilot