Individual audio files can be added to each phase of an experiment and act as a soundtrack over other elements.
You also have the option to customize audio files in your experiment. You can:
loop an audio file several times during a phase; or
choose when you want an audio file to stop in a phase.
If you don't loop an audio file or its duration is shorter than the duration of the phase, it will stop at the end of the file and not re-play.
To add an audio file to a stimuli phase, click on the Settings button, then select Audio Overlay.