Mark Levinson N 320S Owner's Manual page 35

Nº 320S Basic Operation
The Mute parameter can be used to determine the amount of
master volume level attenuation that occurs when mute is
activated. The mute level can be set in 0.1dB increments
between –10.0 and –80.0dB. The factory-default mute level is
–20.0dB.
Note
Pressing the volume ± buttons deactivates mute, adjusting
master volume from the muted volume level.
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(continued)