Fission... With Fission's streamlined audio editing, you can quickly copy, paste and trim audio, as well as split files. Fission also works with compressed MP3 and AAC formats to edit without the quality loss caused by other editors. Get perfect quality audio when editing natively in the MP3, AAC, Apple Lossless, AIFF and WAV formats

Key Features:

• Edit MP3, AAC, Apple Lossless, and AIFF files with

  no quality loss

• Quickly split a long audio file into smaller files
• Remove unwanted content, such as commercials, from your audio file
• Re-arrange audio in a single file, copy audio from one file to another, or merge with a quick drag and drop
• Create great-sounding MP3 or AAC ringtones for your cell phone.