This feature was deliberately left until last as continually listening to the same sound effect can become quite irritating! MP3 is probably the best supported format for various web browsers, with one exception—Dartium.
Dartium is built from the Chromium open source project. The project does not include any proprietary codecs including MP3. When creating projects, it is sometimes fine to just use MP3 and test the audio parts of the application in another browser.
For this project, three formats of the same sound file are provided. The OGG format will run from Dartium and most browsers. If you are having trouble, try another format.
To create a sound effect to play when the slide changes, a ...