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I have a long music mp3 file and want to cut out a part in the middle. I would like to create a smooth transition between the end of the first and the start of the second part, like a crossfade, and time it pricesely to keep both parts in sync.

I know how to do this from the command line with ffmpeg. But is there also a visual tool for macOs to do this manually, for more conveniently / visually timing the exact crossfade position?

Back in the old days I have used SoundForge on Windows. Is there something like that for macOs, preferably open source?

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The easy answer is Audacity:

  • Free, Gratis & Open Source
  • Cross Platform, Windows, Linux & Mac OS-X.
  • Multi-track
  • Supports most sound file formats
  • Adjust volume with Compressor, Amplify, Normalize, Fade In/Out, Studio Fade Out, Crossfade Clips, Crossfade Tracks and Adjustable Fade effects.

Personally I find it fills every audio editing task that I have ever needed.

Official Screenshot

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