Press the [Mute] key.
The Mute indicator starts blinking to indicate the microphone has been muted.
To cancel mute, press the [Mute] key again.
The Mute indicator turns off to indicate that mute has been cancelled.
If the digital audio input/output device is connected, you cannot mute them from the machine. For details about how to mute your the digital audio input/output device, see the respective manual for device.