For the Voice device to recognize and register silence, you need to set the Threshold slider to the minimum sound level that is considered speech. This can also help to filter out any background noise affecting your live input or pre-recorded audio files.

To set a threshold:

1. Listen to the audio file or have the voice input begin speaking, and watch the Threshold meter in the Voice device settings.

   During speech, the Threshold meter rises to a peak value and returns to a lower value when speech stops. It registers at zero when there is no sound. At zero, the model’s mouth is closed.

2. Determine the minimum noise level during silent periods and drag the Threshold slider up to that level on the Threshold meter.

   Generally, the higher the ambient noise level in your audio input, the higher you need to set the Threshold level. However setting the Threshold slider too high causes the Voice device to ignore all but the loudest speech.

   

   A. Threshold meter B. Threshold slider

3. Play the audio again and observe the effect this Threshold slider placement has on your character’s mouth movement. Continue adjusting the Threshold slider as necessary.

• Smoothing phoneme transitions
• Voice device settings