Rogue Amoeba’s ‘Fission’ is a streamlined audio editor designed to get you editing in minutes, not hours. It works with MP3, AAC, Apple Lossless and AIFF audio, enabling you to instantly trim and split files with no quality loss.
Fission uses:
• Losslessly edit MP3s, AAC, Apple Lossless and AIFF files. No re-encoding or switching formats means perfect audio quality for your files.
• Break a long recording up, by using split to create multiple files.
• Remove unwanted audio, like commercials, from audio you want to keep.
• Fade audio in and out to create a pleasing listening experience.
• Create MP3 and AAC ringtones for your cell phone.
Fission is available as a trial download and retails for US$32. If you already own Audio Hijack Pro, you can purchase Fission for $18.
More info here.