Audio can be rendered from the Render Menu.
- Relative Path
Select the file path relative to the blend-file.
Sample accuracy, important for animation data (the lower the value, the more accurate).
- Audio Containers
Some Audio Containers also have option to choose a codec. For more information see here.
- Split Channels
Each audio channel will be rendered into a separate file.
See Scene Audio settings.
See Audio Output settings.
See Audio Preferences.