Fission

Fission is an audio editing application that performs basic editing operations without quality loss, even in compressed formats. The program supports multiple audio formats including MP3, AAC, FLAC, Apple Lossless, AIFF, and WAV, offering cut, join, split, and batch conversion functions.

★★★★★

5.0(1 ratings)

• Lossless quality editing. Fission edits compressed formats like MP3 and AAC without degrading audio quality. This feature avoids the recompression that occurs in other editors, maintaining the integrity of the original sound during cutting, copying, and pasting processes.
• Batch conversion. The batch conversion function processes multiple files simultaneously into different formats. It supports conversions between MP3, AAC, Apple Lossless, FLAC, AIFF, and WAV, with control over quality parameters and metadata.
• Smart silence splitting. Automatically detects silent segments in long audio files to split them into separate tracks. This feature is handy for separating LP recordings or concerts into individual songs.
• File joining. Combines multiple audio files into one via drag-and-drop or copy-and-paste operations. It preserves the original formats during joining without requiring intermediate conversion.
• Gain adjustment. Modifies the volume of specific sections or entire files using a slider control. It allows normalizing audio levels between different recordings for playback consistency.
• Fade in and fade out. Applies smooth volume transitions at the beginning and end of tracks. Fades prevent abrupt cuts and create professional transitions between audio segments.
• Chapter support. Creates MP3 and AAC files with chapter markers for enhanced podcasts. Listeners can navigate between specific content segments using playback controls.
• Metadata editing. Modifies embedded information in audio files such as title, artist, album, and year. Metadata is preserved during editing and conversion operations.
• Cue sheet support. Imports and exports CUE Sheet files to define split points in long files. This feature facilitates track organization in full album recordings.
• Precision trimming. Removes unwanted sections from audio files by selecting and cutting. The trim function maintains timing synchronization and does not affect the remaining portions of the audio.
• Ringtone creation. Generates custom tones for iOS devices via the specific export option. Allows adjusting the duration and start point of the selected audio.
• Audio normalization. Adjusts the overall volume level of a file to a predefined standard value. This function equalizes amplitude between different recordings for consistent playback.

Fission was developed by Rogue Amoeba, a company specialized in audio software for macOS. The program was initially released in 2007 and is written in Objective-C and Swift, using native macOS frameworks for audio processing.

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