This guide helps you understand why you have no or low sound when playing back your practice answers.
Use a different input device
You may have more than one microphone attached to your system, especially if you're using an external webcam. Try selecting a different audio device using the in-app settings menu shown during the practice questions.
If no devices are listed, you may need to grant permission for the application to use your camera and microphone.
Adjust the microphone sensitivity
You can adjust the microphone sensitivity in your system's settings.
Windows
Click Speaker > Recorders > Microphone > Settings > Level. You can now increase the sensitivity of the microphone.
Mac
Click the Apple icon > System Preferences > Sound. You can now configure the sensitivity of the microphone input.