First, to use the command line converter, you need to use Audio Converter Pro to create a profile. The profile is simply the settings you want to use for the convertion, including file type and audio settings, defined in the "Format" panel.
Now, select "File | Save Conversion List..." in Audio Converter Pro.
Save the file to a easy-to-find location
The conversion list contains the complete Audio Converter settings, including the file list and output directory. However, when used with the command line converter, only the Format panel information is used.
Now you can use the command line converter with the -f, -t, and -p parameters. You can use double quotes to identify a long file name. The following is an example: