Make sure that the volume on your device is turned up.
Try using different headphones or speakers to determine where the issue resides.
Ensure that the sensitivity slider within the settings window is not all the way to the left
Ensure that the app has access to the external microphone (iOS). Go to your iOS devices’ general settings. Scroll down to Mogees and make sure that ‘Allow MOGEES TO ACCESS’ ‘Microphone’ is enabled.
You may also need to clean your headphone socket if the Mogees sensor is not detected.