The output filename can be empty (or @code{-}) to refer to the default system output device or a number that refers to the device index as shown using: @code{-list_devices true}.
Alternatively, the audio input device can be chosen by index using the
@option{
-audio_device_index <INDEX>
}
, overriding any device name or index given in the input filename.
All available devices can be enumerated by using @option{-list_devices true}, listing
all device names, UIDs and corresponding indices.
@subsection Options
AudioToolbox supports the following options:
@table @option
@item -audio_device_index <INDEX>
Specify the audio device by its index. Overrides anything given in the output filename.
@end table
@subsection Examples
@itemize
@item
Print the list of supported devices and output a sine wave to the default device: