Note: The externalUrl must be accessible. The
sourceDurationfield must match the actual duration of the source audio file. The sum ofstartInSourceanddurationmust be less than or equal tosourceDuration, which allows you to use only a portion of the audio clip in the timeline - usuallystartInSourceis 0, and only differs from 0 when the audio node has been trimmed from the front of the source audio. WhenstartInSourceis not 0, you should setisFrontTrimmedto true. Thevolumefield enables volume adjustments for precise sound control.