SoundCraft Ghost User Manual page 171

38) I hear the MIX B signals in the
MAIN MIX.
GHOST Troubleshooting
38) The MIX B TO MIX switch is
pressed.
38) When the MIX B TO MIX switch
is pressed in the master section, all
MIX B signals are routed to the MAIN
MIX. To prevent this, make sure the
MIX B TO MIX switch is in the UP
position.
10.7