stimuli not in sync


I am trying to programme an experiment in which I will randomly pairing a visual and auditory stimuli together.

However, I noticed that when I run the experiment, the stimuli are not in sync (there is an obvious delay in the auditory stimuli).

Any help?

Thank you

This is not enough information because it does not tell me how the experiment is created. Can you please post as an Experiment Package? This is found under the File menu within SuperLab.