In addition to its common properties, the audio element has several properties of its own.
|Identical to duration from the common properties, but with the addition that it can be set to media to make the element as long as the source audio clip.
|The URL of an audio clip (an mp3) you want to insert. If it was uploaded using the template editor, it may also be its internal GUID.
|Trims the source audio clip to begin at the specified time (in seconds) rather than at the beginning of the audio file.
|Trims the source audio clip so that it stops playing after the specified duration (in seconds) rather than at the end of the clip.
|When set to true, the audio clip starts over when it reaches the end. This property cannot be used in conjunction with the trim_start and trim_duration properties.
|Adjusts the volume from 0% to 100%.
|Fades in the volume for the specified duration (in seconds) at the beginning of the audio clip.
|Fades out the volume for the specified duration (in seconds) at the end of the audio clip.
Check out the template editor's documentation on the audio element as well.