Roland VS-1680 Owner's Manual page 24

Chapter 1 Before You Start (VS-1680 Terminology)
RECORDING Bus:
Signals assigned to the RECORDING bus are routed to the recorder section to be
recorded. There are eight channels which can be assigned to the output of the
input mixer, track mixer, and effects (Return). Signals assigned to the RECORD-
ING bus cannot be routed to the MIX bus.
MIX Bus:
Signals assigned to the MIX bus are sent to the MASTER jacks for monitoring. It
has two channels (L and R), and can take output signals from the input mixer,
track mixer, and effects (Return). Signals assigned to the MIX bus cannot be rout-
ed to the RECORDING bus.
EFFECT Bus:
Signals assigned to the EFFECT bus are sent to the VS8F-2 to apply effects added
to them. It has four channels (EFX1 L/R, EFX2 L/R), and can process signals
from the input mixer and the track mixer. Signals assigned to the RECORDING
bus as well as the MIX bus can also be routed to the EFFECT bus.
AUX Bus:
Signals assigned to the AUX bus are routed to the AUX jacks to allow addition
mixes for monitoring. This bus features six channels (AUX1 L/R, AUX2 L/R,
AUX3 L/R), and can take signals from the input mixer and the track mixer.
Signals assigned to the RECORDING bus as well as the MIX bus can also be
routed to the AUX bus. This is convenient if, for example, you want to connect
an external effects device, or when you want an addition output separate from
that of the MASTER Out jacks (individual out).
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EFFECT bus and AUX bus
If VS-1680 installed two VS8F-2s, AUX bus (AUX1 L/R, AUX2 L/R) works
as EFFECT bus (EFX3 L/R, EFX4 L/R).