Focusrite Scarlett 18i8 User Manual page 30

Monitor level control knob
Set the output level of all selected outputs with this control, using the mouse. The
numeric display below shows the current monitor output level.
Dim
Attenuates the monitor output level by 18 dB.
Mute
Mutes all monitor outputs.
Left Mute switch
Mutes all odd-numbered outputs.
Right Mute switch
Mutes all even-numbered outputs.
Mono switch
Sums (combines) the odd- and even-numbered output signals in pairs. The summed
signals are then sent to both outputs of each pair.
NOTE: Remember that the monitor functions above only affect the outputs that have been selected
for control in the monitor control section (i.e., outputs showing 'blue' status).
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