Select Audio Attributes Window
Attributes button in the Save As window.
The Select Audio Attributes window lists all combinations of attributes supported by a given file type. Use the Filters boxes to find the attributes required. Only attributes that match the filters are listed. The Attributes and File Compression sections explain the different kinds of attributes that may be listed.
An item in the list must be selected before choosing OK.
Use presets to save and quickly select commonly used attributes. Some presets are included for Wave, MP3, M4A, and FLAC files.