al_set_sample_instance_speed - Man Page

#include <allegro5/allegro_audio.h>

bool al_set_sample_instance_speed(ALLEGRO_SAMPLE_INSTANCE *spl, float val)

Set the relative playback speed of the sample instance. 1.0 means normal speed.

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

al_get_sample_instance_speed(3)

al_get_sample_instance_speed(3).