Allen&Heath GL4000 USER GUIDE - Manual (Page 21)

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GROUP
MATRIX MASTER - Controls the output of the matrix mix. Adjust LEV
to trim the output level to match the connected equipment. ON switches
the output on or off, ideal for checking the effect of individual or combinations
of speakers in a multispeaker system. AFL lets you monitor the signal
post level trim, post insert, but pre ON switch.
OUTPUT REVERSE - This underpanel mode switch reverses the matrix
output jack with the related aux output XLR and switches the aux insert out
of the aux signal path and into the matrix path. This gives the matrix a
balanced XLR for driving the long cable runs to the amplifier racks, and
an insert for plugging in processing devices such as graphic EQ and delay
units. You could also use this to provide aux outputs on jack, often more
convenient when connecting to some of the lower cost effects devices.
Note that only the connectors are reversed. The matrix and aux control
sections are not affected.
TRIM ON - With this underpanel mode switch in the normal up position
the group output is fed post fader to the output XLR. Press the switch to
insert a level trim control in the group output signal path. This does not
affect the level of the subgrouping to LR and M. You can also select
whether the group output is sourced pre or post the group fader. This
facility is most useful when using the group outputs for recording. The
recording can be adjusted independent of the subgrouping and faders.
METER - 12 segment, 3 colour peak reading
meter. Each meter can be switched to monitor
either the main fader signal (normally group) or
the small fader signal (normally aux). The
switch does not affect the optional VU meterpod
which always follows the main fader signals.
AUX MASTER - Provides fader control of the
aux send output. Includes a pre fader aux
meter to display signal activity and warn of
potential mix overload. AFL monitors the post
insert, post fader signal. You can listen to the
effect of graphic EQ typically inserted in a stage
monitor signal path. The MUTE switch is part
of the console mute grouping and automation
system and includes preview and safe.
GROUP REVERSE - Press this underpanel
mode switch to reverse the aux and group
control sections. This configures the group for
stage monitor operation giving you auxes on
the main faders. The groups are still available
on the small faders. The aux and group output
connectors are not affected.
TALKBACK TO AUX - This switch enables
talkback to the related aux mix. When selected,
pressing the large TALK switch routes talkback
to the aux. When not selected, pressing TALK
does not affect the aux.