Voiceovers
To add a voiceover to a video, drag the Voiceover button to the left side. You can then enter the text to be spoken, and also select the voice, gender and accent to be used. Alternatively, you can add a custom voiceover by selecting (or dragging) an audio file. You can use personalization within the voiceover text, and you can add pauses, with a specified duration. You can also set the Scene Duration in seconds; the scene will end at the completion of this time, even if the voiceover or video is not complete. By default Scene Duration is set to Auto, which means that the scene ends when the voiceover is complete.
Start Delay
If you specify a custom voiceover, you can specify a Start Delay, using the following dialog:
The Delay is the time in seconds from the start of the scene to the start of the voiceover. Note that if the voiceover length (including any delay) is longer than the scene duration, a warning message is displayed (and the voiceover will be truncated to the length of the scene).
SSML
You can embed SSML (Speech Synthesis Markup Language) source code within the voiceover text. For more information, see SSML.
Editing a voiceover
When a voiceover has been added, the icon 
is displayed under the video icon. Click this to edit the voiceover.
Adding voiceover cues
Voiceover cues are points inserted into a voiceover that can be referenced when specifying the timing of video overlays. For example, a button could appear when the voiceover narration reaches a specified point.
To insert a cue into a voiceover, move the cursor to the place in the text where the cue is to be inserted, then click the Add voiceover cue button:
The default naming convention for voiceover cues is Cue_01, Cue_02, and so on. However, you can change this to whatever name you like, but note that spaces are not allowed in the name.
An example of two voiceover cues added to a voiceover is shown below:
For information about how to use voiceover cues when specifying the timing of overlays, see Timing tab.