I suggest that you make your webapp detect whether the browser is allowing audio and popping up advice on how to turn it on. Both Chrome (on Linux) and Safari (on Mac) came up without audio by defaut. There were no settings or FAQ obvious about things to try. On Safari the audio came back on when I navigated away from the presentation and then back. On Chrome I had to click right on the tab to get the unmute button.
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hi please add this to the feature requests tab. This tab is for bugs & issues only :)