delayed presentation of audio versus visual

I have two questions:

First, I am wondering how I can set up a trial that includes both audio and visual stimuli and in which the audio stimulus begins 500ms after the visual stimulus is presented.

Second, I was curious if there is a way in SuperLab to start measuring RTs at a specific point within the audio stimulus. For example, I am trying to measure RTs after a variable amount of time after the audio starts. In other words, I may want to start measuring RTs 300ms after the beginning of the audio file but before the audio ends. This delay (e.g. 300 ms) varies from trial to trial.

Thank you

Robert

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