SM Pro Audio M-Patch 2: Passive Stereo Controller/Switch Box - Manual (Page 9)

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5.4 On/Off Mute Switch
The on/off mute switch on the front panel is for enabling and disabling the M-
Patch 2‘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.
5.5 Mono/Stereo Summing Switch
The mono/stereo summing switch on the front panel of the M-Patch 2 al-
lows 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, prepara-
tion for AM radio, etc.
Select the desired mode of operation by positioning the mono/stereo switch in the
up or down position.
5.6 Headphone amplifier and output connector
A headphone amplifier 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 amplifier requires the connection of the external
power supply.