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NAME
       al_get_sample_instance_gain - Allegro 5 API
SYNOPSIS
              #include <allegro5/allegro_audio.h>
              float al_get_sample_instance_gain(const ALLEGRO_SAMPLE_INSTANCE *spl)
DESCRIPTION
       Return the playback gain of the sample instance.
SEE ALSO
       al_set_sample_instance_gain(3alleg5)
Allegro reference manual                                                    al_get_sample_instance_gain(3alleg5)