Yamaha mLAN Mixer Owner's Manual page 8

H Channel fader
The channel fader enables you to adjust the channel level. Click and hold
down the mouse button on the fader and slide the mouse up and down,
or click a desired point on the fader to move the fader to that point.
I Channel level meter
The channel level meter is displayed on the right side of the channel
fader. The channel meter source is always the signal just after the gain, so
the channel level meter displays the level of the input signal and is not
affected by the EQ, Dynamics or the fader.
J Link (Link switch)
When this switch is turned on, adjacent channels (1 and 2, 3 and 4, etc.)
are linked to each other for stereo operation.
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