Aviom AN-16/i - Manual (Page 28)

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If your mixer has direct outputs available, a cable from each channel that you
want to be part of the monitoring system or audio network is connected to
the AN‑16/i inputs. A maximum of sixteen direct outputs can be plugged into
a single AN‑16/i Input Module.
Submixing
If you have more than sixteen direct outputs from a mixer that need to be
monitored in a system using only one AN‑16/i, then some of the channels will
need to be submixed. This can be accomplished on most consoles by using
a bus output (referred to as a group output on some consoles), described
below. A submix is simply a selected group of channels assigned to a single
output.
Bus Outputs
A bus (or group) output is typically used to route audio signals to a recording
device or to control the volume of a group of channels from a single
fader. Most mixers equipped with bus outputs have fewer bus outputs
than channels. Four, eight, or sixteen bus outputs are common mixer
configurations.
To use a bus output with the AN‑16/i Input Module, the individual channels
in your mixer need to be assigned to the desired bus output. This is usually
done with a selector button located somewhere within each channel strip.
Assigning a channel to a bus output does not remove the signal from the
main mix. (Some mixers do allow the option, however.) Specific instructions
about how to use your particular mixer in this case are beyond the scope of
this document. Consult your mixer’s documentation to learn more.
With a number of channels assigned to a bus output, you can then control the
level of the bus independent of the other levels on the mixer. The individual
channel level fader is used to set the relative balance of all channels assigned
to the bus.
The following example shows a typical mixer. Five of the audio channels are
first assigned to bus #1 using the buttons in the channel strip. This routes
their audio signals to the bus output faders seen on the right side of the
mixer. The level for the combined channels is set by this fader. The output
of the bus fader can be patched as needed to a monitoring system, audio
distribution network, recording device, etc.