ART Audio mark.
Members:
| IG_ARTX_audio_bounds_get | Queries the bounding rectangle. |
| IG_ARTX_audio_bounds_set | Updates the bounding rectangle. |
| IG_ARTX_audio_create | Creates an instance of the mark. |
| IG_ARTX_audio_filename_get | Queries the file name of the annotation. |
| IG_ARTX_audio_filename_set | Updates the file name of the annotation. |
| IG_ARTX_audio_play | Plays audio sound. |