SM Pro Audio M-Patch V2: Passive Monitor Controller - Manual (Page 9)

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5.5 On/Off Mute Switch
The on/off mute switch on the front panel is for enabling and disabling the
M-Patch V2‘s built in mute function. All audio signal output is disabled when
the mute switch is in a depressed position.
The mute led will illuminate when the system is in a current muted state of operation.
5.6 Mono/Stereo Summing Switch
The mono/stereo summing switch on the front panel of the M-Patch V2
allows you to sum a stereo signal to a mono signal. This can be very
handy when testing your audio for certain issues like phase cancellation,
preparation for AM radio, etc.
Select the desired mode of operation by positioning the mono/stereo switch in the
up or down position.
5.7 Headphone amplifi er and output connector
A headphone amplifi er is provided for monitoring the audio signal selected by the
‚Input Selection‘ control switches.
Simply connect a pair of headphones to the 1/4” TRS headphone connector socket
and use the rotary headphone volume control knob to adjust the volume level to
your desired setting.
* Note: Use of the headphone amplifi er requires the connection of the external
power supply.