SoundCraft Spirit Folio 4 - Manual (Page 9)

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Each pair of Groups may feed post-fade to two Aux
busses as a stereo pair, with a choice of Aux 5/6 or
7/8 depending on the position of the 7-8 switch. These
controls will be found particularly useful for sending to
reverb units, chained reverb effects, side fill feeds,
alternate PA stacks or individual zones in clubs.
Two pairs of audio GROUPS may be fed from the
Channels or Stereo Returns to form subgroups or
separate controllable outputs..
MIX routes the Groups as a stereo pair to Mix
Left/Right (Group 1 & 3 to Mix Left, Groups 2 & 4 to
Mix Right).
The FADERS control overall GROUP level to the chosen
destination.
A MONO switch is provided to turn Aux
7/8 into summed mono outputs if a greater
number of mono sends is required. Note
that in this instance the position of the
channel PAN and BAL controls may affect
the Aux 7/8 output level.
MASTER LEVEL Each of the Auxiliary Send busses is provided
with a rotary master level control. Aux 1-4 are individual
controls, while Aux 5/6 and Aux 7/8 are stereo pairs.
Just like the PFL switches on the channels, you can monitor the AUX 1-4 outputs by
pressing the AFL (After Fade Listen) switch, routing the AUX output signal to the
MONITOR or PHONES.
The RIGHT PPM METER also switches from the selected source to display the PFL/AFL
signal and the PFL/AFL LED lights to warn that a PFL or AFL switch is pressed.
When you let go of the switch the Monitor returns to the previous source.