al_set_mixer_quality - Allegro 5 API

       Set the mixer quality.  This can only succeed if the mixer does not have anything attached to it.

       Returns true on success, false on failure.

       al_set_mixer_quality - Allegro 5 API

ALLEGRO_MIXER_QUALITY(3alleg5), al_get_mixer_quality(3alleg5)

Allegro reference manual                                                           al_set_mixer_quality(3alleg5)

              #include <allegro5/allegro_audio.h>

              bool al_set_mixer_quality(ALLEGRO_MIXER *mixer, ALLEGRO_MIXER_QUALITY new_quality)