Peavey PRO COMM U1002 Operating Manual page 20

Selecting/Changing MUTE:
Press the "MENU" button until the "VOL" function is selected. This will be
indicated by a block that will appear around the selected function located in
the upper right corner of the display.
Press the "GROUP" ▲ button or the "SCAN" ▼ button to place the
receiver in a "Mute" or "ON." Press the Menu button to save and escape.
CAUTION:
The AF meter and the Antenna "A," "B" will not be functional with
the receiver muted. To determine if the receiver is in the "MUTE"
position, press the "MENU" button until the "VOL" function is
selected and it will be indicated by LCD display "MUTE" if muted
and "ON" if unmuted.
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