1. Click the Home button, then go to General.

2. Under Audio Source, select Coaxial, and click OK to save the settings.

3. Click the Home button again, then select Encode.

4. Choose the Channel and ensure the Video/Audio option is enabled. If it is not, enable it and click OK to save the settings.

5. Return to the Preview screen. Move your mouse pointer to the top of the desired channel. A pop-up will appear; click the Audio button to unmute.