Fission

Fission is an audio editor made by Rogue Amoeba. (FYI, personally I only use it to create and tag my final .m4a files.)

You can join files, crop and trim audio, and rapidly split up long files. Fission is streamlined for fast editing, and it works without the quality loss other audio editors cause.

One thing that Fission does that almost no other editor does is edit MP3’s and save them with no generation loss. Meaning, it doesn’t re-encode the MP3 audio to create another lesser-quality MP3 when saving; it simply uses the original MP3 audio information to avoid generation loss.

With Fission you can also:

• Convert between audio formats – export or batch convert files to the MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV formats.
• Create chapters in MP3 and AAC files.
• Tag files

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