Simultaneous presentation of auditory stimulus and visual stimulu

Hi. I’m sure that this must be possible but I must be missing the obvious.I want to present a visual stimulus and an auditory stimulus at the same time…right now, I can only get them to present sequentially. Is there any way to start the audio file and have the visual stimulus come on before the audio clip ends? I am selecting the visual and auditory stimuli from two separate but paired stimulus lists. Thanks.

this should certainly be possible. I have a similar experiment myself.
Your intended Trial should be linking to 2 stimulus lists - one for images and one for tones.
Make the image list come above the audio list - this way the image will be shown almost exactly as the tone starts.
If the tone list is above the image list, I have seen they become un-synced significantly.
Hope this helps.