If I understand correctly, you could create this kind of thing as a small HTML page and insert it as a background (in a specified region) to any item--see "background" in the questionnaire section of the online help or user's guide for more detail. Let me know if that doesn't make any sense or if you have any trouble with it. I'm guessing you could also find the HTML code for something like that with a google search on "html button beep" or "html button play sound" or such.