al_mixer_has_attachments - Allegro 5 API

       Returns true if the mixer has something attached to it.

       al_mixer_has_attachments - Allegro 5 API

al_get_mixer_attached(3alleg5),                              al_attach_sample_instance_to_mixer(3alleg5),
       al_attach_audio_stream_to_mixer(3alleg5), al_attach_mixer_to_mixer(3alleg5), al_detach_mixer(3alleg5)

       5.2.9

Allegro reference manual                                                       al_mixer_has_attachments(3alleg5)

              #include <allegro5/allegro_audio.h>

              bool al_mixer_has_attachments(const ALLEGRO_MIXER* mixer)