I want to painlessly double the volume of and cut up audio files, for free on Windows 10 and/or Ubuntu.
Audacity does the latter, but I'm overwhelmed attempting the first.
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A nice, free, lightweight audio editor that is not audacity is Wavosaur. It allows you to cut, move, and edit the volume of audio files. Cutting is simply done using standard cut/copy/paste commands, and volume is done via the process menu.
Best of all, the largest version is only just over a megabyte!