Charles, you can assign the FSFC to Bus mode in the 'Ref' menu, go Ref > Next then press the knob below FSFC. That will bring up another menu and the first knob allows the selection of input or bus mode for that FSFC.
Be aware that if you put the syncs in bus mode any unlocked sources will be unlocked in the multiviewer windows and will only appear locked when selected into preview.
Nigel
#Carbonite