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Full user review
"Pretty good with one caveat"
This review was originally posted on VersionTracker.com.
Although the 'best of class' in stereo audio editors remains Amadeus II IMJ, Fission is easy to use and has some useful features, most notably the ability to edit MP3 files nondestructively (without recompressing the audio). Problem is, while you can cut, crop, and edit, there is no support for joining or combining files. So, say you recorded a 90 min file in Rogue Amoeba's own Audio Hijack Pro as an MP3 file, with AHP set to create a new file every 30 minutes (to keep file sizes down for easy editing). You cannot edit commercials etc out of the smaller files and then combine them into one. Sorry, but I consider this a significant limitation for an audio editor, one which is not shared by Amadeus, SoundStudio, or even the free Audacity. If you need lossless editing of MP3 or AAC file, you need Fission. If you don't, Amadeus does a lot more (including many useful signal processing tools) for a little less money. Lastly, if you already have Audio Hijack Pro, RA will give you a significant discount that makes Fission a much better value. Bottom line, Fission is a good app with a unique feature (lossless MP3/AAC editing) that needs a file joining capability update ASAP.