al_set_sample_instance_gain - Man Page

#include <allegro5/allegro_audio.h>

bool al_set_sample_instance_gain(ALLEGRO_SAMPLE_INSTANCE *spl, float val)

Set the playback gain of the sample instance.

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

al_get_sample_instance_gain(3)

al_get_sample_instance_gain(3).