You can configure shortcut keys for controlling the sound volume of the default device: turn it up, turn it down, mute, or unmute. Whenever you perform any of these actions, a slider (like that on a TV screen) will be displayed in the lower part of the screen.
Audio devices in Windows are the ones that you can use to play or record audio. This means that each time you listen to your favorite songs or talk on the microphone, you are using audio devices. When you listen to music (or any sound that comes from your computer), you are using the playback functionality that lets you hear the sounds in your speakers or headphones. An audio device can also record sounds coming from your microphone (for example, your voice) or from your computer (for example, the sounds produced by your playback device), thus providing the recording functionality.
Use these actions to change the default device: Change the default playback device and Change the default recording device.