Emicsoft Audio Converter for Mac is a tool that helps you convert audio files.
WAV, AAC, AC3, M4A, etc...a feature of joining...you convert, join
Aunsoft Video to Audio Converter allows you to extract audio from video files.
M4A, OGG, AC3, AU ...source files. Join audio tracks
Key features: Convert any AVI to WMV, MP4...
or iMovie * Join/trim/merge...helps you join/merge...), etc. Audio: AC3, WMA, AAC