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How to edit audio
Install a software that can edit sound on your computer.
You can purchase a cd or download the program from the internet and just follow the steps in the installation guide for that program. There are many programs available but here are some of the popular ones that you may want to choose from.
Audacity: an open source software that can record and edit multiple tracks. It also has a very effective noise removal function to remove hissing, static and humming by simply selecting a sample of the noise and then removing it from the whole track.