Casio XJ-A Series User Manual page 87

Volume +/–: Raises or lowers the current volume setting by 1.
Mute: Switches mute on or off.
*1 Top of projector upwards
*2 Top of projector downwards
Function
Command
RW
Name
+: VLP W
–: VLM
MUT RW
87
Setting Range
0 to 30
0: Off, 1: On