Allegro 5 api
#include <allegro5/allegro_audio.h> bool al_set_audio_stream_speed(ALLEGRO_AUDIO_STREAM *stream, float val)
Set the relative playback speed. 1.0 is normal speed.
Return true on success, false on failure. Will fail if the sample instance is attached directly to a voice.
al_get_audio_stream_speed(3alleg5).