Initialises the sound module.
Initialises the sound module. You should normally pass DIGI_AUTODETECT
and MIDI_AUTODETECT as the driver parameters to this function, in which
case Allegro will read hardware settings from the current configuration
file. This allows the user to select different values with the setup
utility: see the config section for details. Alternatively, see the
platform specific documentation for a list of the available drivers. The
cfg_path parameter is only present for compatibility with previous
versions of Allegro, and has no effect on anything.
Returns zero if the sound is successfully installed, and -1 on failure.
If it fails it will store a description of the problem in allegro_error.
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