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al_set_sample_instance_gain(3)                  al_set_sample_instance_gain(3)

NAME
       al_set_sample_instance_gain - Allegro 5 API

SYNOPSIS

              #include <allegro5/allegro_audio.h>

              bool al_set_sample_instance_gain(ALLEGRO_SAMPLE_INSTANCE *spl, float val)

DESCRIPTION
       Set the playback gain.

       Returns true on success, false on failure.  Will fail if the sample
       instance is attached directly to a voice.

SEE ALSO
       al_get_sample_instance_gain(3)

Allegro reference manual                        al_set_sample_instance_gain(3)