Sounds won't play across multiple slides on the web
Sounds can play across multiple slides in the PowerPoint PPT / PPS version of your presentation, but when converted to HTML, sounds stop when you leave the slide (web page) they're on.
For examples and a much more thorough tutorial on publishing PowerPoint presentations to the web (including how to play sound throughout the entire presentation and make the presentation open full screen) please visit MVP Michael Koerner's PPT to HTML Tutorial
Search terms: frames, html, sound
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