The Volume knob affects all sound on your computer, but each input can be turned up or down individually by adjusting the sound/mixer settings. To adjust the setting,
◆Your audio system may be muted. Press the Mute button on the keyboard. If the message Mute Off appears, you just turned off the mute feature; your system should now produce sound. If the message Mute On appears, you just muted your system; press the Mute button again to turn it off.
◆The subwoofer (optional third speaker) has its own volume control on the back; turn it clockwise to increase the volume.
◆Make sure that headphones are not plugged into the keyboard. If they are, sound goes to the headphones.
Speakerphone I’m getting squealing noise from the speakers or the microphone.
◆During a phone call, turn the Volume knob
on the keyboard counterclockwise to decrease the volume.
◆Click the Volume icon and drag the volume bar downward.
◆If your display is against a wall or other object, pull it out a few inches.
◆If your display is underneath a shelf or large object, pull the display out.