Edit audio on Linux with Audacity: 
The Audacity sound editor is one of those open source applications that filled a niche that seemingly nobody else realized existed. Initially developed at Carnegie Mellon University at a time when many people still thought computers were just for office and schoolwork, and you required special DSP peripherals for serious multimedia work. Audacity recognized that, occasionally, the average computer user needed to edit audio. The Audacity team has consistently provided an open source application for recording and cleaning up sound in the two decades since.
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