al_set_voice_playing - Allegro 5 API

       Change  whether  a  voice  is playing or not.  This can only work if the voice has a non-streaming object
       attached to it, e.g. a sample instance.  On success the voice’s current sample position is reset.

       Returns true on success, false on failure.

       al_set_voice_playing - Allegro 5 API

al_get_voice_playing(3alleg5)

Allegro reference manual                                                           al_set_voice_playing(3alleg5)

              #include <allegro5/allegro_audio.h>

              bool al_set_voice_playing(ALLEGRO_VOICE *voice, bool val)