ATT LEVEL (Attenuation Level)
Sets how far the volume is decreased when the MUTE button is pressed.
-20 dB / -40 dB / -∞(Default: -∞)
“ATT” appears on the display if the MUTE button is pressed when -20 dB or -40 dB is set.
“MUTE” appears on the display if the MUTE button is pressed when -∞ is set.
Press the MUTE button again to cancel the setting and return to the original volume.