Press the Project tab from the top menu bar of EZ-Builder
Press Add Control from the button ribbon bar of EZ-Builder
Sound Servo (PC Mic)
icon to add the control to your project
Control servos by the microphone sound source from your computer soundcard. You can control many servos with this control by using the Configure option. Specify the scalar to increase the dynamic range of the audio in relation to the position of the servo. Don't worry if that sounds confusing, play with it and see what you get.
Use this control for a moving mouth of your robot. If there is a vocal track playing, you can have your robot's mouth move to the audio.